Regex in JavaScript for validating decimal numbers

Question

I want a regex in JavaScript for validating decimal numbers   It should allow only up to two decimal places  For example  it should allow 10 89 but not 10 899    It should also allow only one period      For example  it should allow 10 89 but not 10 8 9

User · Answer

Regex     d     d 1 2          Demo   x000D   x000D  var regexp      d     d 1 2       x000D   x000D  console log    74  returns     regexp test   74     x000D  console log   7  returns     regexp test  7     x000D  console log   10 5  returns     regexp test  10 5     x000D  console log   115 25  returns     regexp test  115 25     x000D  console log   1535 803  returns     regexp test  1535 803     x000D  console log   153 14 5  returns     regexp test  153 14 5     x000D  console log   415351108140  returns     regexp test  415351108140     x000D  console log   415351108140 5  returns     regexp test  415351108140 5     x000D  console log   415351108140 55  returns     regexp test  415351108140 55     x000D  console log   415351108140 556  returns     regexp test  415351108140 556     x000D   x000D   x000D      Explanation         the beginning and end of the expression     whatever follows should be at the beginning of the string you re testing  d    there should be at least one digit        this part is optional      here goes a dot  d 1 2    there should be between one and two digits here     whatever precedes this should be at the end of the string you re testing     Tip  You can use regexr com or regex101 com for testing regular expressions directly in the browser

User · Answer

function CheckValidAmount             var amounttext   document getElementById  txtRemittanceNumber   value                      if       -    d     d    test amounttext                 alert  Please enter only numbers into amount textbox                document getElementById  txtRemittanceNumber   value    10 00                     This is the function which will take decimal number with any number of decimal places and without any decimal places   Thanks

User · Answer

as compared from the answer gven by mic    it doesnt validate anything in some of the platforms which i work upon    to be precise it doesnt actually work out in Dream Viewer    hereby   i re-write it again  which will work on any platform      0-9     0-9  1 2        thnkss

User · Answer

Try a regular expression like this         0        0-9    0 1     0-9  1 2   0 1      Allowed  1  10 8  10 89   89  0 89  1000  Not Allowed  20    50 89 9  12 999     Null character Note this works for positive numbers

User · Answer

Numbers with at most 2 decimal places      d       d 1 2        This should work fine  Please try out

User · Answer

Please see my project of the cross-browser filter of value of the text input element on your web page using JavaScript language  Input Key Filter   You can filter the value as an integer number  a float number  or write a custom filter  such as a phone number filter  See an example of custom filter of input of an float number with decimal pointer and limitation to 2 digit after decimal pointer    x000D   x000D   lt  doctype html gt  x000D   lt html xmlns  http   www w3 org 1999 xhtml   gt  x000D   lt head gt  x000D       lt title gt Input Key Filter Test lt  title gt  x000D    lt meta name  author  content  Andrej Hristoliubov anhr mail ru  gt  x000D    lt meta http-equiv  Content-Type  content  text html  charset utf-8   gt  x000D    x000D    lt  -- For compatibility of IE browser with audio element in the beep   function  x000D   https   www modern ie en-us performance how-to-use-x-ua-compatible -- gt  x000D    lt meta http-equiv  X-UA-Compatible  content  IE 9   gt  x000D    x000D    lt link rel  stylesheet  href  https   rawgit com anhr InputKeyFilter master InputKeyFilter css  type  text css  gt    x000D    lt script type  text javascript  src  https   rawgit com anhr InputKeyFilter master Common js  gt  lt  script gt  x000D    lt script type  text javascript  src  https   rawgit com anhr InputKeyFilter master InputKeyFilter js  gt  lt  script gt  x000D    x000D   lt  head gt  x000D   lt body gt  x000D    lt h1 gt Float field lt  h1 gt  x000D   lt input id  Float   x000D   onchange  javascript  onChangeFloat this   x000D   onblur  inputKeyFilter isNaN parseFloat this value   this    x000D    gt  x000D   lt script gt  x000D   function CreateFloatFilterCustom elementID  onChange  onblur   x000D    try  x000D     inputKeyFilter Create elementID x000D        onChange x000D        function elementInput  value    customFilter x000D       if value match    -  d        d 0 2        i     null   x000D        inputKeyFilter TextAdd isRussian     x000D                              - 0   9   0   9      - 0   9 e- 0   9             -12 34 1234  x000D             Acceptable formats  - 0   9   0   9  or - 0   9 e- 0   9   Examples  -12 34 1234  x000D           elementInput   x000D        return false  x000D         x000D       return true  x000D        x000D        onblur x000D       x000D      catch e    x000D     consoleError  Create float filter failed      e   x000D      x000D     x000D    x000D   CreateFloatFilterCustom  Float    x000D    x000D   function onChangeFloat input   x000D    inputKeyFilter RemoveMyTooltip    x000D    var elementNewFloat   document getElementById  NewFloat    x000D    var float   parseFloat input value   x000D    if inputKeyFilter isNaN float  input    x000D     elementNewFloat innerHTML       x000D     return  x000D      x000D    elementNewFloat innerHTML   float  x000D     x000D   lt  script gt  x000D   New float   lt span id  NewFloat  gt  lt  span gt  x000D   lt  body gt  x000D   lt  html gt  x000D   x000D   x000D    Also see my page example of the input key filter

User · Answer

The schema for passing the value in as a string  The regex will validate a string of at least one digit  possibly followed by a period and exactly two digits          type    string        pattern      0-9       0-9  2          The schema below is equivalent  except that it also allows empty strings          type    string        pattern         0-9       0-9  2

User · Answer

I found that I could use    d     d       for more than two decimal places

User · Answer

Try the following expression    d    d 0 2   If you want the decimal places to be optional  you can use the following    d     d 1 2      EDIT  To test a string match in Javascript use the following snippet   var regexp      d    d 0 2         returns true regexp test  10 5

User · Answer

Does this work    0-9  2   0-9  2

User · Answer

Since you asked for decimal numbers validation  for completeness  sake  I d use a regex that doesn t allow strings like 06 05      0    d 1 2       1-9  d     d 1 2         Slightly more complicated  but returns false in that case

User · Answer

d     d 1 2       will allow    244 10 89 9 5   will disallow    10 895 10  10 8 9

[javascript] Regex in JavaScript for validating decimal numbers

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