Validate phone number using javascript

Question

I m trying to validate phone number such as 123-345-3456 and  078 789-8908 using JavaScript  Here is my code  function ValidateUSPhoneNumber phoneNumber      var regExp         0-9  3      0-9  3 -  0-9  3 - 0-9  4      var phone   phoneNumber match regExp     if  phone        alert  yes        return true        alert  no      return false      I m testing the function using ValidateUSPhoneNumber  123-345-34567   which has 5 digits before the last hyphen which is invalid as per regex  But the function returns true  Can any one explain why

User · Answer

Add a word boundary  b at the end of the regex         0-9  3      0-9  3 -  0-9  3 - 0-9  4  b    if the space after   is optional         0-9  3    s   0-9  3 -  0-9  3 - 0-9  4  b

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This is by far the easiest way I have found to use javascript regex to check phone number format  this particular example checks if it is a 10 digit number   lt input name  quot phone quot  pattern  quot   d 10   quot  type  quot text quot  size  quot 50 quot  gt   The input field gets flagged when submit button is clicked if the pattern doesn t match the value  no other css or js required

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1  s     0-9  3    -     0-9  3  -     0-9  3  -    0-9  4      This will validate all US style numbers  with or without the 1  and with or without parenthesis on area code but if used  used properly  I E   902-455-4555 will not work since there is no closing parenthesis  it also allows for either - or a space between sets if wanted   It will work for the examples provided by op

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You can use this jquery plugin   http   digitalbush com projects masked-input-plugin   Refer to demo tab  phone option

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Here s how I do it    x000D   x000D  function validate phone    x000D    const regex          0-9  3      -      0-9  3   -      0-9  4      x000D    console log regex test phone   x000D    x000D   x000D  validate  1234567890          true x000D  validate 1234567890           true x000D  validate   078 789-8908       true x000D  validate  123-345-3456        true x000D   x000D   x000D

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Can any one explain why     This happening because your regular expression doesn t end with any anchor meta-character such as the end of line   or a word boundary  b   So when you ask the regex engine whether 123-345-34567 is valid phone number it will try to find a match within this string  so it matches 123- with this part     0-9  3      0-9  3 -  then it matches 345- with this part  0-9  3 - then it matches 3456 with this part  0-9  4    Now the engine finds that it has walked the entire regex and found a string inside your input that matches the regex although a character was left - the number 7- in the input string  so it stops and returns success because it found a sub-string that matches   If you had included   or  b at the end of your regex  the engine walks the same way as before then it tries to match   or  b but finds the last number - the 7 - and it is not a word boundary  b nor a an end of line   so it stops and fails to find a match

User · Answer

If you using on input tag than this code will help you  I write this code by myself and I think this is very good way to use in input  but you can change it using your format  It will help user to correct their format on input tag       phone   on  input   function        this is use for every time input change          var inputValue   getInputValue      get value from input and make it usefull number         var length   inputValue length    get lenth of input          if  inputValue  lt  1000                        inputValue    1   inputValue           else if  inputValue  lt  1000000                         inputValue    1    inputValue substring 0  3          inputValue substring 3  length            else if  inputValue  lt  10000000000                         inputValue    1    inputValue substring 0  3          inputValue substring 3  6     -    inputValue substring 6  length            else                       inputValue    1    inputValue substring 0  3          inputValue substring 3  6     -    inputValue substring 6  10                                phone   val inputValue     correct value entered to your input          inputValue   getInputValue     get value again  becuase it changed  this one using for changing color of input border        if   inputValue  gt  2000000000   amp  amp   inputValue  lt  9999999999                         phone   css  border   black solid 1px     if it is valid phone number than border will be black         else                       phone   css  border   red solid 1px     if it is invalid phone number than border will be red                     function getInputValue              var inputValue       phone   val   replace   D g         remove all non numeric character         if  inputValue charAt 0     1     if first character is 1 than remove it                        var inputValue   inputValue substring 1  inputValue length                     return inputValue

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JavaScript to validate the phone number    x000D   x000D  function phonenumber inputtxt    x000D    var phoneno          0-9  3      -      0-9  3   -      0-9  4      x000D    if inputtxt value match phoneno     x000D      return true  x000D      x000D    else   x000D      alert  message    x000D      return false  x000D      x000D    x000D   x000D   x000D    The above script matches   XXX-XXX-XXXX XXX XXX XXXX XXX XXX XXXX  If you want to use a   sign before the number in the following way  XX-XXXX-XXXX  XX XXXX XXXX   XX XXXX XXXX use the following code    function phonenumber inputtxt      var phoneno          0-9  2      -      0-9  4   -      0-9  4        if inputtxt value match phoneno         return true          else         alert  message        return false

User · Answer

can anyone explain why   because your regular expression does match the input   It s just that the input also includes the extra characters   You included     to signify the beginning of line  but  as Andy said  you should include     to signify the end of line   If you start your regex with     and end it with      then it will only match lines that only match your regex   By starting your regex with     and not ending it with      you match lines that start with a sequence matching your regex  but lines can have anything else trailing the matching sequence

User · Answer

Add a   to the end of the regex to signify the end of the pattern   var regExp         0-9  3    s   0-9  3 -  0-9  3 - 0-9  4

User · Answer

0-9  3        s  -  1    0-9  3    s  -  1    0-9  4    Assuming you are validating US phone numbers  this will do the trick   First  we allow 0 or 1 open parentheses to start      Then  we allow 3 consecutive digits between 0-9  0-9  3   After  we repeat the first step and allow 0 or 1 closing parentheses      For the second grouping  we start by allowing a space or a hyphen 0 or 1 times    s  -  1      This is repeated between the second and third grouping of numbers  and we check for 3 consecutive digits then four consecutive digits to end it  For US phone numbers I think this covers the bases for a lot of different ways that people might format the number  but is restrictive enough that they can t pass an unreasonable string

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In JavaScript  the below regular expression can be used for a phone number        1    s-        1-9  d d     s-   1-9  d d  s-   d d d d e g  9999875099   8750999912 etc  Reference   https   techsolutions filebizz com 2020 08 regular-expression-for-phone-number-in html

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x000D   x000D  function validatePhone inputtxt    x000D    var phoneno          0-9  3      -      0-9  3   -      0-9  4      x000D    return phoneno test inputtxt  x000D    x000D   x000D   x000D

User · Answer

This regular expression       0-9  3    s   0-9  3  -  0-9  3 - 0-9  4    validates all of the following    123-345-3456     078 789-8908     078  789-8908      Note the space   To break down what s happening      The group in the beginning validates two ways  either  XXX  or XXX-  with optionally spaces after the closing parenthesis  The part after the group checks for XXX-XXX

[javascript] Validate phone number using javascript

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