What is “The Best” U.S. Currency RegEx?

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here’s some stuff from the makers of Regex Buddy. These came from the library so i’m confident they have been thoroughly tested.

Number: Currency amount (cents mandatory)
Optional thousands separators; mandatory two-digit fraction

Match; JGsoft:
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*\.[0-9]{2}$

Number: Currency amount (cents optional)
Optional thousands separators; optional two-digit fraction

Match; JGsoft:
^[+-]?[0-9]{1,3}(?:,?[0-9]{3})*(?:\.[0-9]{2})?$

Number: Currency amount US & EU (cents optional)
Can use US-style 123,456.78 notation and European-style 123.456,78 notation. Optional thousands separators; optional two-digit fraction

Match; JGsoft:
^[+-]?[0-9]{1,3}(?:[0-9]*(?:[.,][0-9]{2})?|(?:,[0-9]{3})*(?:\.[0-9]{2})?|(?:\.[0-9]{3})*(?:,[0-9]{2})?)$

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