How to validate phone numbers using regex

Question

I m trying to put together a comprehensive regex to validate phone numbers  Ideally it would handle international formats  but it must handle US formats  including the following    1-234-567-8901 1-234-567-8901 x1234 1-234-567-8901 ext1234 1  234  567-8901 1 234 567 8901 1 234 567 8901 12345678901   I ll answer with my current attempt  but I m hoping somebody has something better and or more elegant

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Note that stripping    characters does not work for a style of writing UK numbers that is common   44  0  1234 567890 which means dial either the international number   441234567890 or in the UK dial 01234567890

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I found this to be something interesting  I have not tested it but it looks as if it would work   lt  php    string validate telephone number  string  number  array  formats      function validate telephone number  number   formats     format   trim ereg replace   0-9          number     return  in array  format   formats     true   false        Usage Examples        List of possible formats  You can add new formats or modify the existing ones   formats   array     -   -            -   -                                 -           -    -                           -   -    -            -           -   -                             -   -                       number    08008-555-555    if validate telephone number  number   formats     echo  number   is a valid phone number       echo   lt br   gt      number    123-555-555    if validate telephone number  number   formats     echo  number   is a valid phone number       echo   lt br   gt      number    1800-1234-5678    if validate telephone number  number   formats     echo  number   is a valid phone number       echo   lt br   gt      number     800  555-123    if validate telephone number  number   formats     echo  number   is a valid phone number       echo   lt br   gt      number    1234567890    if validate telephone number  number   formats     echo  number   is a valid phone number        gt

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I believe the Number  Phone  US and Regexp  Common   particularly the source of Regexp  Common  URI  RFC2806  Perl modules could help   The question should probably be specified in a bit more detail to explain the purpose of validating the numbers   For instance  911 is a valid number in the US  but 911x isn t for any value of x   That s so that the phone company can calculate when you are done dialing   There are several variations on this issue   But your regex doesn t check the area code portion  so that doesn t seem to be a concern   Like validating email addresses  even if you have a valid result you can t know if it s assigned to someone until you try it   If you are trying to validate user input  why not normalize the result and be done with it   If the user puts in a number you can t recognize as a valid number  either save it as inputted or strip out undailable characters   The Number  Phone  Normalize Perl module could be a source of inspiration

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This is a simple Regular Expression pattern for Philippine Mobile Phone Numbers        0-9  2   0    -   9 0-9  2    -    0-9  3    -    0-9  4    or      63  0    -   9 0-9  2    -    0-9  3    -    0-9  4    will match these     63 917 123 4567    63-917-123-4567    63 917 123 4567    639171234567   09171234567     The first one will match ANY two digit country code  while the second one will match the Philippine country code exclusively   Test it here  http   refiddle com 1ox

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Although the answer to strip all whitespace is neat  it doesn t really solve the problem that s posed  which is to find a regex   Take  for instance  my test script that downloads a web page and extracts all phone numbers using the regex   Since you d need a regex anyway  you might as well have the regex do all the work   I came up with this   1  W   2-9  0-8  0-9   W   2-9  0-9  2   W   0-9  4    se x t   d       Here s a perl script to test it   When you match   1 contains the area code   2 and  3 contain the phone number  and  5 contains the extension   My test script downloads a file from the internet and prints all the phone numbers in it      usr bin perl  my  us phone regex            1  W   2-9  0-8  0-9   W   2-9  0-9  2   W   0-9  4    se x t   d         my  tests      1-234-567-8901    1-234-567-8901 x1234    1-234-567-8901 ext1234    1  234  567-8901    1 234 567 8901    1 234 567 8901    12345678901    not a phone number      foreach my  num   tests            if   num    m  us phone regex                              print  match   1- 2- 3  n  if not defined  4                  print  match   1- 2- 3  5  n  if defined  4                    else                           print  no match   num  n                    Extract all phone numbers from an arbitrary file    my  external filename            http   web textfiles com ezines PHREAKSANDGEEKS PnG-spring05 txt   my  external file    curl  external filename   foreach my  line   external file            if   line    m  us phone regex                              print  match  1  2  3 n                 Edit   You can change  W  to  s  W  s  in the regex to tighten it up a bit   I wasn t thinking of the regex in terms of  say  validating user input on a form when I wrote it  but this change makes it possible to use the regex for that purpose    1  s  W  s   2-9  0-8  0-9   s  W  s   2-9  0-9  2   s  W  s   0-9  4    se x t   d

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Working example for Turkey  just change the  d 9    according to your needs and start using it   function validateMobile  phone         pattern       05  d 9          if   preg match  pattern   phone                 return false            return true      phone    0532486061    if  validateMobile  phone         echo  Incorrect Mobile Number        phone    05324860614   if validateMobile  phone         echo  Correct Mobile Number

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b  d 3    d  0 2  d 3    d  0 2  d 4   b

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Java generates REGEX for valid phone numbers Another alternative is to let Java generate a REGEX that macthes all variations of phone numbers read from a list  This means that the list called validPhoneNumbersFormat  seen below in code context  is deciding which phone number format is valid  Note  This type of algorithm would work for any language handling regular expressions  Code snippet that generates the REGEX  Set lt String gt  regexSet   uniqueValidPhoneNumbersFormats stream            map s - gt  s replaceAll  quot     quot    quot       quot             map s - gt  s replaceAll  quot   d quot    quot     d quot             map s - gt  s replaceAll  quot     quot    quot       quot             map s - gt  s replaceAll  quot            quot    quot      1 quot             collect Collectors toSet      String regex   String join  quot   quot   regexSet    Code snippet in context  public class TestBench        public static void main String   args            List lt String gt  validPhoneNumbersFormat   Arrays asList                   quot 1-234-567-8901 quot                    quot 1-234-567-8901 x1234 quot                    quot 1-234-567-8901 ext1234 quot                    quot 1  234  567-8901 quot                    quot 1 234 567 8901 quot                    quot 1 234 567 8901 quot                    quot 12345678901 quot                    quot  12345678901 quot                    quot  234  567-8901 ext  123 quot                    quot  1 234-567-8901 ext  123 quot                    quot 1  234  567-8901 ext  123 quot                    quot 00 1 234-567-8901 ext  123 quot                    quot  210-998-234-01234 quot                    quot 210-998-234-01234 quot                    quot  21099823401234 quot                    quot  210- 998 - 234 - 01234  quot                    quot   351  282 43 50 50 quot                    quot 90191919908 quot                    quot 555-8909 quot                    quot 001 6867684 quot                    quot 001 6867684x1 quot                    quot 1  234  567-8901 quot                    quot 1-234-567-8901 x1234 quot                    quot 1-234-567-8901 ext1234 quot                    quot 1-234 567 89 01 ext 1234 quot                    quot 1 234 5678901x1234 quot                    quot  123 8575973 quot                    quot  0055  123 8575973 quot                      Set lt String gt  uniqueValidPhoneNumbersFormats   new LinkedHashSet lt  gt  validPhoneNumbersFormat            List lt String gt  invalidPhoneNumbers   Arrays asList                   quot  210-99A-234-01234 quot            FAIL                  quot  210-999-234-0  quot   quot 234 quot         FAIL                  quot  210-999-234-02 4 quot             FAIL                  quot -210 998-234-01234 quot            FAIL                  quot  210-998 - 234- 01234 quot         FAIL                    List lt String gt  invalidAndValidPhoneNumbers   new ArrayList lt  gt             invalidAndValidPhoneNumbers addAll invalidPhoneNumbers           invalidAndValidPhoneNumbers addAll uniqueValidPhoneNumbersFormats            Set lt String gt  regexSet   uniqueValidPhoneNumbersFormats stream                    map s - gt  s replaceAll  quot     quot    quot       quot                     map s - gt  s replaceAll  quot   d quot    quot     d quot                     map s - gt  s replaceAll  quot     quot    quot       quot                     map s - gt  s replaceAll  quot            quot    quot      1 quot                     collect Collectors toSet              String regex   String join  quot   quot   regexSet            List lt String gt  result   new ArrayList lt  gt             Pattern pattern   Pattern compile regex           for  String phoneNumber   invalidAndValidPhoneNumbers                Matcher matcher   pattern matcher phoneNumber               if matcher matches                      result add matcher group                                         Output          if uniqueValidPhoneNumbersFormats size      result size                  System out println  quot All valid numbers was matched  n quot                          result forEach System out  println              Output  All valid numbers was matched   1-234-567-8901 1-234-567-8901 x1234 1-234-567-8901 ext1234

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It s near to impossible to handle all sorts of international phone numbers using simple regex    You d be better off using a service like numverify com  they re offering a free JSON API for international phone number validation  plus you ll get some useful details on country  location  carrier and line type with every request

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It turns out that there s something of a spec for this  at least for North America  called the NANP    You need to specify exactly what you want  What are legal delimiters  Spaces  dashes  and periods  No delimiter allowed  Can one mix delimiters  e g    0 111-222 3333   How are extensions  e g   111-222-3333 x 44444  going to be handled  What about special numbers  like 911  Is the area code going to be optional or required    Here s a regex for a 7 or 10 digit number  with extensions allowed  delimiters are spaces  dashes  or periods             1 s      -  s           s   2-9 1 02-9   2-9  02-8 1  2-9  02-8  02-9   s      2-9 1 02-9   2-9  02-8 1  2-9  02-8  02-9    s      -  s       2-9 1 02-9   2-9  02-9 1  2-9  02-9  2   s      -  s     0-9  4      s      x    ext    extension  s   d

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I found this to work quite well           1-9  0 3    -  1-9  0 3  -         2-9  d 2     -      d 3  -      d 4   e x t       d 0 4     It works for these number formats   1-234-567-8901 1-234-567-8901 x1234 1-234-567-8901 ext1234 1  234  567-8901 1 234 567 8901 1 234 567 8901 12345678901 1-234-567-8901 ext  1234   351  282 433 5050   Make sure to use global AND multiline flags to make sure   Link   http   www regexr com 3bp4b

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If you re talking about form validation  the regexp to validate correct meaning as well as correct data is going to be extremely complex because of varying country and provider standards  It will also be hard to keep up to date   I interpret the question as looking for a broadly valid pattern  which may not be internally consistent - for example having a valid set of numbers  but not validating that the trunk-line  exchange  etc  to the valid pattern for the country code prefix   North America is straightforward  and for international I prefer to use an  idiomatic  pattern which covers the ways in which people specify and remember their numbers           d 3       d 3 -   d 3 - d 4        d 2   -    d 1 8   1 5      x  ext  d 1 5   0 1     The North American pattern makes sure that if one parenthesis is included both are   The international accounts for an optional initial     and country code   After that  you re in the idiom   Valid matches would be     xxx xxx-xxxx  xxx -xxx-xxxx  xxx xxx-xxxx x123 12 1234 123 1 x1111 12 12 12 12 12 12 1 1234 123456 x12345  12 1234 1234  12 12 12 1234  12 1234 5678  12 12345678   This may be biased as my experience is limited to North America  Europe and a small bit of Asia

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My attempt at an unrestrictive regex                     0-9   ext -pw              6 45      Accepts     01  123  456  789 ext555 123456  44 123-456-789  321  123456 123456789012345678901234567890123456789012345                 123456tteexxttppww   Rejects   mob 07777 777777 1234 567 890 after 5pm john smith  empty  1234567890123456789012345678901234567890123456 911   It is up to you to sanitize it for display  After validating it could be a number though

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I was struggling with the same issue  trying to make my application future proof  but these guys got me going in the right direction  I m not actually checking the number itself to see if it works or not  I m just trying to make sure that a series of numbers was entered that may or may not have an extension   Worst case scenario if the user had to pull an unformatted number from the XML file  they would still just type the numbers into the phone s numberpad 012345678x5  no real reason to keep it pretty  That kind of RegEx would come out something like this for me    d    w 0 9    d     01234467 extension 123456 01234567x123456 01234567890

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If at all possible  I would recommend to have four separate fields   Area Code  3-digit prefix  4 digit part  extension   so that the user can input each part of the address separately  and you can verify each piece individually  That way you can not only make verification much easier  you can store your phone numbers in a more consistent format in the database

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Do a replace on formatting characters  then check the remaining for phone validity   In PHP      replace   array        -                                etc  as needed  preg match    1  0-9  10   ext x  0-9  1 4    i   str replace   replace       phone num      Breaking a complex regexp like this can be just as effective  but much more simple

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I work for a market research company and we have to filter these types of input alllll the time  You re complicating it too much  Just strip the non-alphanumeric chars  and see if there s an extension   For further analysis you can subscribe to one of many providers that will give you access to a database of valid numbers as well as tell you if they re landlines or mobiles  disconnected  etc  It costs money

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Here s one that works well in JavaScript  It s in a string because that s what the Dojo widget was expecting   It matches a 10 digit North America NANP number with optional extension  Spaces  dashes and periods are accepted delimiters            d  d  d        -        d  d  d   -        d 4 4     -       ext         d

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I answered this question on another SO question before deciding to also include my answer as an answer on this thread  because no one was addressing how to require not require items  just handing out regexs  Regex working wrong  matching unexpected things From my post on that site  I ve created a quick guide to assist anyone with making their own regex for their own desired phone number format  which I will caveat  like I did on the other site  that if you are too restrictive  you may not get the desired results  and there is no  quot one size fits all quot  solution to accepting all possible phone numbers in the world - only what you decide to accept as your format of choice   Use at your own risk  Quick cheat sheet  Start the expression      If you want to require a space  use     s  or  s If you want to require parenthesis  use       and        Using    and    is ugly and can make things confusing  If you want anything to be optional  put a   after it If you want a hyphen  just type - or  -    If you do not put it first or last in a series of other characters  though  you may need to escape it    - If you want to accept different choices in a slot  put brackets around the options   -  s  will require a hyphen  period  or space   A question mark after the last bracket will make all of those optional for that slot   d 3     Requires a 3-digit number   000-999   Shorthand for  0-9  0-9  0-9    2-9     Requires a digit 2-9 for that slot      1 s     Accept a  quot plus quot  or a 1 and a space  pipe character     is  quot or quot    and make it optional   The  quot plus quot  sign must be escaped  If you want specific numbers to match a slot  enter them   246  will require a 2  4  or 6      77 78  or  77 78  will require 77 or 78       End the expression

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You ll have a hard time dealing with international numbers with a single simple regex  see this post on the difficulties of international  and even north american  phone numbers   You ll want to parse the first few digits to determine what the country code is  then act differently based on the country   Beyond that - the list you gave does not include another common US format - leaving off the initial 1   Most cell phones in the US don t require it  and it ll start to baffle the younger generation unless they ve dialed internationally   You ve correctly identified that it s a tricky problem     -Adam

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Better option    just strip all non-digit characters on input  except  x  and leading     signs   taking care because of the British tendency to write numbers in the non-standard form  44  0      when asked to use the international prefix  in that specific case  you should discard the  0  entirely    Then  you end up with values like    12345678901  12345678901x1234  345678901x1234  12344678901  12345678901  12345678901  12345678901   4112345678   441234567890   Then when you display  reformat to your hearts content  e g     1  234  567-8901   1  234  567-8901 x1234

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since there are so many options to write a phone number  one can just test that are enough digits in it  no matter how they are separated  i found 9 to 14 digits work for me    D   d D   9 14    true   123456789 1234567890123  123  456  78 90-98 76  false   123  1234  1234 9007199254740991 123 wont do what you tell me  123  456  78 90-98 76  543 ext 210 gt 2 gt 5 gt 3  123  456-7890 in the morning  987  54-3210 after 18 00 and ask for Shirley  if you do want to support those last two examples - just remove the upper limit    d D   9     the    are not needed if there s no upper limit

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As there is no language tag with this post  I m gonna give a regex solution used within python   The expression itself   1  s  -       d       s  -    d   -      d   s   d     When used within python   import re  phonelist   1-234-567-8901 1-234-567-8901 1234 1-234-567-8901 1234 1  234  567-8901 1 234 567 8901 1 234 567 8901 12345678901   phonenumber     n  join  phone for phone in re findall r 1  s  -       d       s  -    d   -      d   s   d     phonelist    print phonenumber    Output   1-234-567-8901 1-234-567-8901 1234 1-234-567-8901 1234 1  234  567-8901 1 234 567 8901 1 234 567 8901 12345678901

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After reading through these answers  it looks like there wasn t a straightforward regular expression that can parse through a bunch of text and pull out phone numbers in any format  including international with and without the plus sign    Here s what I used for a client project recently  where we had to convert all phone numbers in any format to tel  links   So far  it s been working with everything they ve thrown at it  but if errors come up  I ll update this answer   Regex         d 1               d 3     d    d 3     d    d 4     PHP function to replace all phone numbers with tel  links  in case anyone is curious    function phoneToTel  number         return   preg replace        d 1               d 3     d    d 3     d    d 4        lt a href  tel  1 3 4 5  gt  1   3   4- 5 lt  a gt     number      includes international     return  return

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Although it s not regex  you can use the function validate phone   from the Python library DataPrep to validate US phone numbers  Install it with pip install dataprep   gt  gt  gt  from dataprep clean import validate phone  gt  gt  gt  df   pd DataFrame   phone     1-234-567-8901    1-234-567-8901 x1234              1-234-567-8901 ext1234    1  234  567-8901    1 234 567 8901             1 234 567 8901   12345678901   12345678    123-456-78987      gt  gt  gt  validate phone df  phone    0     True 1     True 2     True 3     True 4     True 5     True 6     True 7    False 8    False Name  phone  dtype  bool

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Note It takes as an input a US mobile number in any format and optionally accepts a second parameter - set true if you want the output mobile number formatted to look pretty  If the number provided is not a mobile number  it simple returns false  If a mobile number IS detected  it returns the entire sanitized number instead of true       function isValidMobile num format            if   format  format false         var m1       W       0 1  d 3     0 1     0 1   s-  0 1  d 3   s-  0 1   s   0 1  d 4   W             if  m1 test num                return false                   num   num replace    g     replace     g     replace  - g     replace     g     replace     g     replace     g     replace     g     replace     g     replace     g     replace     g     replace     g     replace     g             if   num length  lt  10      num length  gt  11      num substring 0 1    0       num substring 1 1    0        num length  10  amp  amp  num substring 0 1    1       num length  11  amp  amp  num substring 0 1    1     return false          num    num length    11    num     1    num              if   num length    11   amp  amp   num substring 0 1      1                  if  format   true                   return       num substr 1 3           num substr 4 3     -    num substr 7 4                else                  return num                         else               return false

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I wrote simpliest  although i didn t need dot in it        0-9          -      As mentioned below  it checks only for characters  not its structure order

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I wouldn t recomend using a regex for this   Like the top answer  strip all the ugliness from the phone number  so that you re left with a string of numeric characters  with an  x   if extensions are provided   In Python   Note  BAD AREA CODES comes from a text file that you can grab from on the web   BAD AREA CODES   open  badareacodes txt    r   read   split   n    def is valid phone phone number  country code  US           for now  only US codes are handled        if country code          country code   country code upper         drop everything except 0-9 and  x      phone number   filter lambda n  n isdigit   or n     x   phone number       ext   None     check ext   phone number split  x       if len check ext   gt  1           there s an extension  Check for errors          if len check ext   gt  2              return False         phone number  ext   check ext       we only accept 10 digit phone numbers      if len phone number     11 and phone number 0      1            international code         phone number   phone number 1       if len phone number     10          return False       area code  XXXxxxxxxx       head       xxxXXXxxxx      tail       xxxxxxXXXX     area code   phone number   3      head        phone number 3 6      tail        phone number 6         if area code in BAD AREA CODES          return False     if head 0      1           return False     if head 1       11           return False       any other ideas      return True   This covers quite a bit  It s not a regex  but it does map to other languages pretty easily

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My inclination is to agree that stripping non-digits and just accepting what s there is best  Maybe to ensure at least a couple digits are present  although that does prohibit something like an alphabetic phone number  ASK-JAKE  for example   A couple simple perl expressions might be    f      d   g  tr 0-9  dc    Use the first one to keep the digit groups together  which may give formatting clues  Use the second one to trivially toss all non-digits   Is it a worry that there may need to be a pause and then more keys entered  Or something like 555-1212  wait for the beep  123

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Find String regex            0-9     6 14  0-9      helpful for international numbers

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Here s a wonderful pattern that most closely matched the validation that I needed to achieve  I m not the original author  but I think it s well worth sharing as I found this problem to be very complex and without a concise or widely useful answer   The following regex will catch widely used number and character combinations in a variety of global phone number formats      s         d 1 3      -       d 3   -          d 3   -      d 2 4      - x     d      s   gm  Positive   42 555 123 4567  1- 800 -123-4567  7 555 1234567  7 926 1234567  926  1234567  79261234567 926 1234567 9261234567 1234567 123-4567 123-89-01 495 1234567 469 123 45 67 89261234567 8  926  1234567 926 123 4567 415-555-1234 650-555-2345  416 555-3456 202 555 4567 4035555678 1 416 555 9292  Negative  926 3 4 8 800 600-APPLE  Original source  http   www regexr com 38pvb

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If you just want to verify you don t have random garbage in the field  i e   from form spammers  this regex should do nicely     0-9         s  ext-      Note that it doesn t have any special rules for how many digits  or what numbers are valid in those digits  it just verifies that only digits  parenthesis  dashes  plus  space  pound   asterisk  period  comma  or the letters e  x  t are present   It should be compatible with international numbers and localization formats  Do you foresee any need to allow square  curly  or angled brackets for some regions   currently they aren t included    If you want to maintain per digit rules  such as in US Area Codes and Prefixes  exchange codes  must fall in the range of 200-999  well  good luck to you  Maintaining a complex rule-set which could be outdated at any point in the future by any country in the world does not sound fun   And while stripping all most non-numeric characters may work well on the server side  especially if you are planning on passing these values to a dialer   you may not want to thrash the user s input during validation  particularly if you want them to make corrections in another field

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I would also suggest looking at the  libphonenumber  Google Library  I know it is not regex but it does exactly what you want    For example  it will recognize that   15555555555   is a possible number but not a valid number  It also supports countries outside the US    Highlights of functionality    Parsing formatting validating phone numbers for all countries regions of the world  getNumberType - gets the type of the number based on the number itself  able to distinguish Fixed-line  Mobile  Toll-free  Premium Rate  Shared Cost  VoIP and Personal Numbers  whenever feasible   isNumberMatch - gets a confidence level on whether two numbers could be the same  getExampleNumber getExampleNumberByType - provides valid example numbers for all countries regions  with the option of specifying which type of example phone number is needed  isPossibleNumber - quickly guessing whether a number is a possible phonenumber by using only the length information  much faster than a full validation  isValidNumber - full validation of a phone number for a region using length and prefix information  AsYouTypeFormatter - formats phone numbers on-the-fly when users enter each digit  findNumbers - finds numbers in text input  PhoneNumberOfflineGeocoder - provides geographical information related to a phone number     Examples  The biggest problem with phone number validation is it is very culturally dependant    America    408  974   2042 is a valid US number  999  974   2042 is not a valid US number  Australia   0404 999 999 is a valid Australian number  02  9999 9999 is also a valid Australian number  09  9999 9999 is not a valid Australian number    A regular expression is fine for checking the format of a phone number  but it s not really going to be able to check the validity of a phone number   I would suggest skipping a simple regular expression to test your phone number against  and using a library such as Google s libphonenumber  link to GitHub project    Introducing libphonenumber   Using one of your more complex examples  1-234-567-8901 x1234  you get the following data out of libphonenumber  link to online demo    Validation Results  Result from isPossibleNumber    true Result from isValidNumber       true  Formatting Results   E164 format                     12345678901 Original format                 234  567-8901 ext  123 National format                 234  567-8901 ext  123 International format            1 234-567-8901 ext  123 Out-of-country format from US  1  234  567-8901 ext  123 Out-of-country format from CH  00 1 234-567-8901 ext  123   So not only do you learn if the phone number is valid  which it is   but you also get consistent phone number formatting in your locale   As a bonus  libphonenumber has a number of datasets to check the validity of phone numbers  as well  so checking a number such as  61299999999  the international version of  02  9999 9999  returns as a valid number with formatting   Validation Results  Result from isPossibleNumber    true Result from isValidNumber       true  Formatting Results  E164 format                     61299999999 Original format                61 2 9999 9999 National format                 02  9999 9999 International format            61 2 9999 9999 Out-of-country format from US  011 61 2 9999 9999 Out-of-country format from CH  00 61 2 9999 9999   libphonenumber also gives you many additional benefits  such as grabbing the location that the phone number is detected as being  and also getting the time zone information from the phone number   PhoneNumberOfflineGeocoder Results Location        Australia  PhoneNumberToTimeZonesMapper Results Time zone s      Australia Sydney    But the invalid Australian phone number   09  9999 9999  returns that it is not a valid phone number   Validation Results  Result from isPossibleNumber    true Result from isValidNumber       false   Google s version has code for Java and Javascript  but people have also implemented libraries for other languages that use the Google i18n phone number dataset    PHP  https   github com giggsey libphonenumber-for-php Python  https   github com daviddrysdale python-phonenumbers Ruby  https   github com sstephenson global phone C   https   github com twcclegg libphonenumber-csharp Objective-C  https   github com iziz libPhoneNumber-iOS JavaScript  https   github com ruimarinho google-libphonenumber Elixir  https   github com socialpaymentsbv ex phone number   Unless you are certain that you are always going to be accepting numbers from one locale  and they are always going to be in one format  I would heavily suggest not writing your own code for this  and using libphonenumber for validating and displaying phone numbers

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Here s my best try so far  It handles the formats above but I m sure I m missing some other possible formats     d                 d  1 3           -               d  3    -                   a-zA-Z2-9  a-zA-Z0-9  -   6               xX   i ext        1 2      d  1 5

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You would probably be better off using a Masked Input for this   That way users can ONLY enter numbers and you can format however you see fit   I m not sure if this is for a web application  but if it is there is a very click jQuery plugin that offers some options for doing this     http   digitalbush com projects masked-input-plugin   They even go over how to mask phone number inputs in their tutorial

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For anyone interested in doing something similar with Irish mobile phone numbers  here s a straightforward way of accomplishing it    http   ilovenicii com  p 87  PHP     lt  php  pattern       083 086 085 086 087  d 7       phone    087343266    if  preg match  pattern  phone   echo  Match   else echo  Not match     There is also a JQuery solution on that link   EDIT   jQuery solution         function          original field values     var field values                   id           value              url           url                yourname      yourname                email         email                phone         phone                  var url     input url   val            var yourname     input yourname   val            var email     input email   val            var phone     input phone   val            inputfocus        input url   inputfocus   value  field values  url              input yourname   inputfocus   value  field values  yourname              input email   inputfocus   value  field values  email               input phone   inputfocus   value  field values  phone                reset progress bar         progress   css  width   0            progress text   html  0  Complete           first step        form   submit function    return false              submit first   click function              remove classes             first step input   removeClass  error   removeClass  valid               ckeck if inputs aren t empty         var fields       first step input type text             var error   0          fields each function                var value     this  val                if  value length lt 12    value  field values   this  attr  id                          this  addClass  error                      this  effect  shake     times 3    50                    error                  else                     this  addClass  valid                                               if  error                if      password   val          cpassword   val                               first step input type password    each function                              this  removeClass  valid   addClass  error                              this  effect  shake     times 3    50                                                return false                else                        update progress bar                     progress text   html  33  Complete                        progress   css  width   113px                       slide steps                     first step   slideUp                        second step   slideDown                                                else return false                 second section         submit second   click function              remove classes             second step input   removeClass  error   removeClass  valid             var emailPattern      a-zA-Z0-9  -    a-zA-Z0-9 -     a-zA-Z  2 4               var fields       second step input type text             var error   0          fields each function                var value     this  val                if  value length lt 1    value  field values   this  attr  id           this  attr  id     email   amp  amp   emailPattern test value                          this  addClass  error                      this  effect  shake     times 3    50                    error                  else                     this  addClass  valid                            function validatePhone phone            var a   document getElementById phone  value          var filter      0-9-                   if  filter test a                     return true                            else                   return false                                       phone   blur function e                if  validatePhone  txtPhone                          spnPhoneStatus   html  Valid                        spnPhoneStatus   css  color    green                              else                       spnPhoneStatus   html  Invalid                    spnPhoneStatus   css  color    red                                                 if  error                      update progress bar                     progress text   html  66  Complete                        progress   css  width   226px                       slide steps                     second step   slideUp                        fourth step   slideDown                   else return false                     submit second   click function              update progress bar             progress text   html  100  Complete                progress   css  width   339px               prepare the fourth step         var fields   new Array                  url   val                    yourname   val                    email   val                    phone   val                       var tr       fourth step tr            tr each function                  alert  fields   this  index                    this  children  td nth-child 2    html fields   this  index                             slide steps             third step   slideUp                fourth step   slideDown                                  submit fourth   click function             url     input url   val            yourname     input yourname   val            email     input email   val            phone     input phone   val               send information to server         var dataString    url    url     amp yourname     yourname     amp email     email     amp phone     phone               alert  dataString    return false                  ajax                     type   POST                     url   http   clients socialnetworkingsolutions com infobox contact                      data   url   url   amp yourname   yourname   amp email   email   amp phone     phone                  cache  false                  success  function data                          console log  form submitted                        alert  success                                                    return false                  back button         back   click function            var container     this  parent  div            previous    container prev             switch previous attr  id                  case  first step        progress text   html  0  Complete                          progress   css  width   0px                           break              case  second step       progress text   html  33  Complete                          progress   css  width   113px                           break               case  third step        progress text   html  66  Complete                          progress   css  width   226px                           break           default  break               container  slideUp          previous  slideDown                Source

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00      1-4  d d  1-9  d         -                    d 1       -            0        -               ext    extension x   -            d      i  This matches    -   351  282 43 50 50  - 90191919908  - 555-8909  - 001 6867684  - 001 6867684x1  - 1  234  567-8901  - 1-234-567-8901 x1234  - 1-234-567-8901 ext1234  - 1-234 567 89 01 ext 1234  - 1 234 5678901x1234  -  123 8575973  -  0055  123 8575973   On  n  it saves    Country indicator Phone number Extension   You can test it on https   www regexpal com  fam 99127

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Try this  It is for Indian mobile number validation    if   phoneNumber matches    6-9   d 9          return false    else     return true

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Here is what I use  function isValidTel   tel        preg match              0-9  3      - s     0-9  3  - s     0-9  4 6   im    tel   matches       return     matches      Check it out in this regex tester https   www phpliveregex com p uld

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Have you had a look over at RegExLib   Entering US phone number brought back quite a list of possibilities

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If the users want to give you their phone numbers  then trust them to get it right   If they do not want to give it to you then forcing them to enter a valid number will either send them to a competitor s site or make them enter a random string that fits your regex   I might even be tempted to look up the number of a premium rate horoscope hotline and enter that instead   I would also consider any of the following as valid entries on a web site    123 456 7890 until 6pm  then 098 765 4321     123 456 7890 or try my mobile on 098 765 4321     ex-directory - mind your own business

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My gut feeling is reinforced by the amount of replies to this topic - that there is a virtually infinite number of solutions to this problem  none of which are going to be elegant   Honestly  I would recommend you don t try to validate phone numbers  Even if you could write a big  hairy validator that would allow all the different legitimate formats  it would end up allowing pretty much anything even remotely resembling a phone number in the first place   In my opinion  the most elegant solution is to validate a minimum length  nothing more

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pattern     d             d  s -    d         validateat  onsubmit    Must end with a digit  can begin with   or   or a digit  and may contain   -   or

[regex] How to validate phone numbers using regex

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