How to validate numeric values which may contain dots or commas

Question

I need a regular expression for validation two or one numbers then   or   and again two or one numbers   So  these are valid inputs   11 11   11 11   1 1   1 1

User · Answer

d 1 2      d 1 2     d means a digit  the  1 2  part means 1 or 2 of the previous character   d in this case  and the      part means either a comma or dot

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Shortest regexp I know  16 char    d d      d d    The   and   means begin and end of input string  without this part 23 45 of string like 123 45 will be matched   The  d means digit  the  d  means optional digit  the      means dot or comma  Working example   when you click on left menu gt  tools gt  code generator you can gen code for one of 9 popular languages like c   js  php  java       here   x000D   x000D     TEST        valid    11 11         11 11      1 1      1 1        nonvalid    111 1      11 111      11-11       11      11       a 11      11 a     forEach n  gt      let result      d d      d d    test n     console log    n   padStart 6        is valid    result      x000D   x000D   x000D

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In order to represent a single digit in the form of a regular expression you can use either        0-9  or  d   In order to specify how many times the number appears you would add      0-9       the star means there are zero or more digits        0-9  2        N  means N digits         0-9  0 2      N M  N digits or M digits       0-9  0-9      N-M  N digits to M digits  Note  M can be left blank for an infinite representation   Lets say I want to represent a number between 1 and 99 I would express it as such        0-9  1-2  or  0-9  1 2  or  d 1-2  or  d 1 2    Or lets say we were working with binary display  displaying a byte size  we would want our digits to be between 0 and 1 and length of a byte size  8  so we would represent it as follows        0-1  8   representation of a binary byte    Then if you want to add a   or a   symbol you would use          or    or you can use     or       You can also state a selection between possible values as such            means either a dot or a comma symbol    And you just need to concatenate the pieces together  so in the case where you want to represent a 1 or 2 digit number followed by either a comma or a period and followed by two more digits you would express it as follows         0-9  1 2      d 1-2    Also note that regular expression strings inside C   strings must be double-back-slashed so every   becomes

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d means a digit in most languages  You can also use  0-9  in all languages  For the  period or comma  use        Depending on your language you may need more backslashes based on how you quote the expression  Ultimately  the regular expression engine needs to see a single backslash     means  zero-or-more   so  d  and  0-9   mean  zero or more numbers     means  zero-or-one   Neither of those qualifiers means exactly one  Most languages also let you use  m n  to mean  between m and n   ie   1 2  means  between 1 and 2    Since the dot or comma and additional numbers are optional  you can put them in a group and use the   quantifier to mean  zero-or-one  of that group   Putting that all together you can use    d 1 2         d 1 2       Meaning  one or two digits  d 1 2   followed by zero-or-one of a group        consisting of a dot or comma followed by one or two digits       d 1 2

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d 1 2        1  d 1 2    EDIT  update to meet the new requirements  comments     EDIT  remove unnecesary qtfier as per Bryan    0-9  1 2       0-9  1 2

User · Answer

If you want to be very permissive  required only two final digits with comma or dot          d         d 2

[regex] How to validate numeric values which may contain dots or commas?

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