RegEx needed to match number to exactly two decimal places

Question

I need some regex that will match only numbers that are decimal to two places. For example:

• 123 = No match
• 12.123 = No match
• 12.34 = Match

Answer 1

If you're looking for an entire line match I'd go with Paul's answer.

If you're looking to match a number witihn a line try: \d+\.\d\d(?!\d)

• \d+ One of more digits (same as [0-9])
• \. Matches to period character
• \d\d Matches the two decimal places
• (?!\d) Is a negative lookahead that ensure the next character is not a digit.