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.

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.

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

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.

Validates - URLs with schemes - http, https and ftp Relative URL starting with / and ../

This regex will match any Youtube video ID thrown at it and return one capturing group containing the ID.

Matches single or double quoted strings, and ignores backslash-escaped quotes within the string.

Checks for valid UK/British postcodes. There was another on here that had for some reason been upvoted, but it was actually incorrect as it worked on none of my valid own postcodes! Namely that it assumed two letters and a number (BS3) when you can have variations (M20). Allows for an optional spac...

grabs the ID for the regex101.com permalink to code

Validates DateTime of format YYYY-MM-DD hh:mm:ss including Leap Year