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

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.

Trim leading and trailing whitespace from a string.

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

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

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

Email address, most used cases

Attempts to mimic Google search box behavior, returning an array with the separated search strings (that keep the +/- indicator for following operations)

Allows phone numbers with optional country code, optional special characters and whitespace

Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.

Safe Password that allow only with a number, a lowercase, a uppercase, and a special character

1-15 alphanumeric login name

Captures all fields from a CSV file's line. Can be customized with user-defined field separator and protecting character.