How can I extract a number from a string in JavaScript

Question

I have a string in JavaScript  e g  box2  and I just want the 2 from it  I tried  var thestring     this  attr  href    var thenum   thestring replace          w d  w       i   2    alert thenum    It still returns  box2 in the alert  how can I get it to work  It needs to accommodate for any length number attached on the end

User · Answer

Try the following  string replace    0-9  g       This will delete all non-digit characters  leaving only digits in the string  function retnum str         var num   str replace    0-9  g            return parseInt num 10         x000D   x000D  console log  abca12bc45qw  replace    0-9  g        x000D  console log   box2  replace    0-9  g        x000D   x000D   x000D

User · Answer

Use this one-line code to get the first number in a string without getting errors   var myInt   parseInt myString replace     0-9          10

User · Answer

I think this regular expression will serve your purpose   var num   txt replace    0-9  g        Where txt is your string   It basically rips off anything that is not a digit   I think you can achieve the same thing by using this as well     var num   txt replace   D g

User · Answer

And this is a snippet which extracts prices with currency and formatting   var price      1 739 12   parseFloat price replace      d     g           1739 12

User · Answer

You should try the following   var txt     div-name-1234-characteristic 561613213213   var numb   txt match   d g   numb   numb join      alert  numb      result  1234561613213213

User · Answer

If someone need to preserve dots in extracted numbers  var some    65 87 EUR   var number   some replace  quot   quot   quot   quot   replace    0-9 amp    g      console log number      returns 65 87

User · Answer

you may use great parseInt method  it will convert the leading digits to a number  parseInt  -10px       will give you -10

User · Answer

var elValue        -12 erer3  4 -990 234sdsd    var isNegetive   false  if elValue indexOf  -    0  isNegetive true   elValue       elValue replace      d     g       elValue       isNaN Number elValue     0   Number elValue    if isNegetive  elValue   0 - elValue   alert elValue     -1234990 234

User · Answer

please check below javaScripts  there you can get only number    x000D   x000D  var txt    abc1234char5678  9   x000D  var str   txt match   d  g          x000D  var s   str split      join      x000D  alert Number s    x000D   x000D   x000D    output   1234567789

User · Answer

You can use Underscore String Library  as following   var common   box  var href   box1     href  strRight common    result will be   1   See   https   github com epeli underscore string  DEMO   http   jsfiddle net abdennour Vyqtt    HTML Code      lt p gt       lt a href   box1   gt img1 lt  a gt       lt a href   box2   gt img2 lt  a gt       lt a href   box3   gt img3 lt  a gt       lt a href   box4   gt img4 lt  a gt   lt  p gt   lt div style  font-size 30px  gt  lt  div gt    JS Code     var comm   box     a   click function         div   html     this  attr  href    strRight comm       if you have suffix as following     href  box1az     You can use the next demo     http   jsfiddle net abdennour Vyqtt 1   function retrieveNumber all prefix suffix    var left   all  strRight prefix    return   left  strLeft suffix

User · Answer

Here s a solt  that checks for no data  var someStr    abc      add 123 to string to see inverse  var thenum   someStr match   d      if  thenum    null         console log thenum 0      else    console log  no number

User · Answer

Tried all the combinations cited above with this Code and got it working  was the only one that worked on that string -   12  3456-7890  var str   12  3456-7890   str replace    D  g         Result   1234567890   Obs  i know that a string like that will not be on the attr but whatever  the solution is better  because its more complete

User · Answer

For a string such as  box2  this should work   var thenum   thestring replace        d        1      jsFiddle    http   jsfiddle net dmeku

User · Answer

changeStrangeDate dateString  string    var sum   0  var numbers   dateString match   d  g   if  numbers length  gt  1      numbers forEach element   gt        sum    parseInt element              console log new Date sum  toDateString     return new Date sum  toUTCString         You can do it like that and then call function where you need  with parameter   this changeStrangeDate   Date 1551401820000-0100

User · Answer

For this specific example    var thenum   thestring replace     D  g          replace all leading non-digits with nothing   in the general case    thenum    foo3bar5  match   d    0      3    Since this answer gained popularity for some reason  here s a bonus  regex generator    x000D   x000D  function getre str  num    x000D    if str     num  return  nice try   x000D    var res       D  g   D   g    D   D   g   D  g   D   g      D g    D   D    g     D    d   D   g   x000D    for var i   0  i  lt  res length  i    x000D      if str replace res i           num   x000D        return  num   str replace      res i  source     g        x000D    return  no idea   x000D     x000D  function update     x000D        function x    return document getElementById x     x000D    var re   getre    str   value     num   value   x000D       re   innerHTML    Numex speaks   lt code gt     re     lt  code gt    x000D    x000D   lt p gt Hi  I m Numex  the Number Extractor Oracle  x000D   lt p gt What is your string   lt input id  str  value  42abc  gt  lt  p gt  x000D   lt p gt What number do you want to extract   lt input id  num  value  42  gt  lt  p gt  x000D   lt p gt  lt button onclick  update    gt Insert Coin lt  button gt  lt  p gt  x000D   lt p id  re  gt  lt  p gt  x000D   x000D   x000D

User · Answer

With Regular Expressions  how to get numbers from a String  for example   String myString    my 2 first gifts were made by my 4 brothers   myString   myString  replaceAll    D        System out println  myString       myString     the result of myString is  24   you can see an example of this running code here  http   ideone com iOCf5G

User · Answer

Using match function   var thenum   thestring match   d     0   alert thenum     jsfiddle

User · Answer

You can use regular expression   var txt  some text 2   var numb   txt match   d g   alert  numb     That will alert 2

User · Answer

You can extract numbers from a string using a regex expression   let string    xxfdx25y93 34xxd73   let res   string replace   D g       console log res      output  25933473

User · Answer

This answer will cover most of the scenario  I can across this situation when user try to copy paste the phone number        help number   keyup function          this  val   match   d  g  join             Explanation   str   34  gd 5-67 6-6ds   str match   d  g       It will give a array of string as    output      34    56766     str match   d  g  join       join will convert and concatenate that array data into single string     output     3456766       In my example I need the output as 209-356-6788 so I used replace         help number   keyup function          this  val   this  val   match   d  g  join     replace    d 3   -   d 3   -   d 4      1- 2- 3

User · Answer

You need to add  quot    d  g  quot  which will remove all non-number text  but it will still be a string at this point  If you create a variable and  quot parseInt quot  through the match  you can set the new variables to the array values  Here is an example of how I got it to work      var color      this   css   quot background-color quot         var r   parseInt color match   d  g  0        var g   parseInt color match   d  g  1        var b   parseInt color match   d  g  2

User · Answer

x000D   x000D  function justNumbers string        var numsStr   string replace    0-9  g         return parseInt numsStr          console log justNumbers  abcdefg12hijklmnop     x000D   x000D   x000D   You can do a function like this function justNumbers string                 var numsStr   string replace    0-9  g              return parseInt numsStr          remember  if the number has a zero in front of it  the int wont have it

[javascript] How can I extract a number from a string in JavaScript?

Examples related to javascript

Examples related to regex

Examples related to string

Examples related to numbers