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

Answer 1

\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.