Regular expression for positive decimal number with 0, 1 or 2 decimal places

Question

Please help me make regular expression for positive decimal number with 0, 1 or 2 decimal places. It must allow comma and dot. For example it must allow:

0,0         


        

Answer 1

Edit 2: now disallows exactly 0,0.0, etc.

This matches at least one digit before the decimal place, followed by an optional decimal place, followed by 0-2 digits.

The negative lookahead looks for any flavor of absolute zero and prevents a match.

^(?!0*[.,]0*$|[.,]0*$|0*$)\d+[,.]?\d{0,2}$

This is the raw regex, so you'll need to escape it appropriately for your language. (For example, in some languages you need to double the \ slashes as \\.

/^(?!0*[.,]0*$|[.,]0*$|0*$)\d+[,.]?\d{0,2}$/