Im trying to use a regular expression to validate strings like:
1 %
12,25 %
99,99 %
100 %
100,00 %
Tried with this one from here
^(100\,00|[1-9]?\d\,\d{2}) %$
but i need the decimals to be optional and this one fails with strings like "90 %"
Thank you in advance,
/^(10{2}(?:,0{2})?|[1-9]?\d(?:,\d{2})?) %$/
The pattern allows a percentage of 100,00 or a 1 or 2 digit number (2-digit not starting with 0) optionally followed by a comma and 2 digits.
See Pattern Demo for matching, explanation, and efficiency.
Bonus features:
My pattern uses quantifiers on repeated characters to improve performance.
It doesn't use escaping slashes on commas -- they're not necessary.
It doesn't use more than one capture group, following the OP's pattern design.
So, make the optional parts a capture group with (...) and declare it optional by adding ?
Result:
^(100(\,00)?|[1-9]?\d(\,\d{2})?) %$
Matches:
Won't match: