Regex using javascript to return just numbers

Question

If I have a string like  something12  or  something102   how would I use a regex in javascript to return just the number parts

User · Answer

var result   input match   d  g  join

User · Answer

The answers given don t actually match your question  which implied a trailing number  Also  remember that you re getting a string back  if you actually need a number  cast the result   item item replace      D  d        1    if      d    test item   throw  parse error  number not found   item Number item     If you re dealing with numeric item ids on a web page  your code could also usefully accept an Element  extracting the number from its id  or its first parent with an id   if you ve an Event handy  you can likely get the Element from that  too

User · Answer

Here is the solution to convert the string to valid plain or decimal numbers using Regex    something123 777 321something to 123 777321 const str    something123 777 321something   let initialValue   str replace    0-9             initialValue    123 777 321      characterCount just count the characters in a given string if  characterCount intitialValue        gt  1     const splitedValue   intitialValue split          splittedValue     123   777   321     intitialValue   splitedValue shift           splitedValue join         result i e  initialValue    123 777321

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If you want dot comma separated numbers also  then    d     d    or   0-9      0-9     You can use https   regex101 com  to test your regexes

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As per  Syntle s answer  if you have only non numeric characters you ll get an Uncaught TypeError  Cannot read property  join  of null  This will prevent errors if no matches are found and return an empty string    something  match    d  g        join

User · Answer

IMO the   3 answer at this time by Chen Dachao is the right way to go if you want to capture any kind of number  but the regular expression can be shortened from     -  0 1   d       0 1   d   g   to    -  d     d  g   For example  this code    lin-grad ient 217deg rgba 255  0  0  -0 8   rgba -255 0 0 0  70 71    match  -  d     d  g    generates this array     217   255   0   0   -0 8   -255   0   0   0   70 71     I ve butchered an MDN linear gradient example so that it fully tests the regexp and doesn t need to scroll here  I think I ve included all the possibilities in terms of negative numbers  decimals  unit suffixes like deg and    inconsistent comma and space usage  and the extra dot period and hyphen dash characters within the text  lin-grad ient   Please let me know if I m missing something  The only thing I can see that it does not handle is a badly formed decimal number like  0  8    If you really want an array of numbers  you can convert the entire array in the same line of code   array   whatever match  -  d     d  g  map Number     My particular code  which is parsing CSS functions  doesn t need to worry about the non-numeric use of the dot period character  so the regular expression can be even simpler    -   d     g

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For number with decimal fraction and minus sign  I use this snippet   x000D   x000D  const NUMERIC REGEXP     -  0 1   d      0 1   d   g   const numbers    2 2px 3 1px 4px -7 6px obj key  match NUMERIC REGEXP   console log numbers        2 2    3 1    4    -7 6   x000D   x000D   x000D   Update  - 7 9 2018 Found a tool which allows you to edit regular expression visually  JavaScript Regular Expression Parser  amp  Visualizer  Update  Here s another one with which you can even debugger regexp  Online regex tester and debugger  Update  Another one  RegExr  Update  Regexper and Regex Pal

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Everything that other solutions have  but with a little validation     value    675-805-714  const validateNumberInput    value    gt         let numberPattern     d  g      let numbers   value match numberPattern       if  numbers     null            return 0              return parseInt numbers join           675805714

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If you want only digits   var value    675-805-714   var numberPattern     d  g  value   value match  numberPattern   join      alert value     Show  675805714   Now you get the digits joined

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You could also strip all the non-digit characters   D or   0-9      x000D   x000D  let word With Numbers    abc123c def4567hij89  x000D  let word Without Numbers   word With Numbers replace   D g       x000D   x000D  console log word Without Numbers  x000D   x000D   x000D

User · Answer

I guess you want to get number s  from the string  In which case  you can use the following      Returns an array of numbers located in the string function get numbers input        return input match   0-9   g      var first test   get numbers  something102    var second test   get numbers  something102or12    var third test   get numbers  no numbers here      alert first test       102  alert second test       102 12  alert third test      null

User · Answer

Using split and regex        var str    fooBar0123  split    d          console log str 0       fooBar     console log str 1       0123

User · Answer

Regular expressions   var numberPattern     d  g    something102asdfkj1948948  match  numberPattern     This would return an Array with two elements inside   102  and  1948948   Operate as you wish  If it doesn t match any it will return null   To concatenate them    something102asdfkj1948948  match  numberPattern   join       Assuming you re not dealing with complex decimals  this should suffice I suppose

[javascript] Regex using javascript to return just numbers

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