Validates IPv4 IP Address

A quite neat regular expression for URLs, e-mails..., I found on Matthew O'Riordan's blog.

Matches distorted email addresses and converts them back to real ones.

A neat regex for finding out whether a given torrent name is a series or a movie. Returns the full name of the series with the separator needed to make it pretty (ie, replace it with space or what you want). Also returns the season number or the year for the movie/series, depending on what was prev...

Checks that a password has a minimum of 6 characters, at least 1 uppercase letter, 1 lowercase letter, and 1 number with no spaces.

Trim leading and trailing whitespace from a string.

The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.

Grabs the ID for the regex101.com permalink code. If a revision number is provided, grab that as well.