A regular expression that matches all valid currency formats.
Currency amount with optional thousands separators, negative numbers, and two-digit fraction:
/^-?\d+(,\d{3})*(\.\d{1,2})?$/Examples:
- 100
- -0.99
- 12,345,678.90
Currency amount (no thousands separators, must be positive, two-digit fraction):
/(?:^[1-9]([0-9]+)?(?:\.[0-9]{1,2})?$)|(?:^(?:0)$)|(?:^[0-9]\.[0-9](?:[0-9])?$)/Examples:
- 100
- 0.99
- 1234567890