RegExLib.com - The first Regular Expression Library on the Web!

PCRE (PHP) regular expression for validating US telephone numbers with OPTIONAL area code, and OPTIONAL extension. Promiscuous formatting (parenthesis or slash, space, dash, dot or no separator). Captures the telephone number area code, prefix, suffix, and extension to named groups. Rejects area codes that begin with 0 or 1 and prefixes that begin with 0. Rejects all telephone numbers that do not match on exactly 7 digits, or on exactly 10 digits with the optional area code, not counting the extension or the format. Seperators, when used, must be in the right place. Extension can be preceded by a space(s) and/or "x", "X", or "Ext" and matches on 1 to 5 digits. Written from the view that getting phone numbers from customers should be as easy and tolerant as possible. Matched number can be parsed and entered into database correctly on the business end. Based on similar regex by Jerry Schmersahl in this library. Case insensitivity could simplify this expression, but implementation is left up to you. For PHP/PCRE compatibility, put a "P" in front of each capture name (ie: "(?P<AreaCode>"). This server does not recognize the Python/PCRE naming convention.