Regex to match 2 digits optional decimal two digits

Question

I ve spent half an hour trying to get this  maybe someone can come up with it quickly   I need a regular expression that will match one or two digits  followed by an optional decmial point  followed by one or two digits   For example  it should match these strings in their entirety      3    33     3     33    33 3    33 33   and NOT match anything with more than 2 digits before or after the decmial point

User · Answer

you can use  let regex   new RegExp             0-9   1   maxlength     0-9        0-9  0   decimal number              where you can decide the maximum length and up to which decimal point you want to control the value  Use ES6 String interpolation to wrap the variables   maxlength  and   decimal number

User · Answer

Try this   d 1 2        d 1 2

User · Answer

d 1      d 1 2    d 0 9    tested in https   regexr com    matches with numbers with 2 decimals or just one  or numbers without decimals   You can change the number or decimals you want by changing the number 2

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A previous answer is mostly correct  but it will also match the empty string  The following would solve this      0-9   0-9     0-9  0-9        0-9   0-9      0-9  0-9

User · Answer

lt    d     d 1 2   d 0 2    d 1 2        d      Matches    Your examples 33    Does not match    333 33 33 333

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To build on Lee s answer  you need to anchor the expression to satisfy the requirement of not having more than 2 numbers before the decimal   If each number is a separate string  you can use the string anchors     d 0 2     d 1 2       If each number is within a string  you can use the word anchors    b d 0 2     d 1 2    b

User · Answer

EDIT  Changed to fit other feedback   I understood you to mean that if there is no decimal point  then there shouldn t be two more digits   So this should be it    d 0 2     d 1 2      That should do the trick in most implementations   If not  you can use    0-9   0-9      0-9  0-9       And that should work on every implementation I ve seen

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You mentioned that you want the regex to match each of those strings  yet you previously mention that the is 1-2 digits before the decimal   This will match 1-2 digits followed by a possible decimal  followed by another 1-2 digits but FAIL on your example of  33   d 1 2     d 1 2    This will match 0-2 digits followed by a possible deciaml  followed by another 1-2 digits and match on your example of  33   d 0 2     d 1 2    Not sure exactly which one you re looking for

User · Answer

d 0 2       d 1 2      d 1 2   matches a 1-2 digit number with nothing after it  3  33  etc      d 0 2      matches optionally a number 0-2 digits long followed by a period  3   44      etc    Put them together and you ve got your regex

User · Answer

d 0 2     d 1 2

User · Answer

Following is Very Good Regular expression for Two digits and two decimal points    RegularExpression    d 0 2     d 1 2      ErrorMessage     0  must be a Decimal Number

[regex] Regex to match 2 digits, optional decimal, two digits

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