Matches words without external punctuation but with internal punctuation.

stackoverflow question

This regex defines the end and the beginning of a WindowsUpdate.log event.

get contents of src attribute

just lovely

Matches a password that has been passed in as a url query parameter or in a post dictionary.

If given a linux file path match the filename without the extension. It extracts FileNameWithoutExtension into its own match group so that you can use it in things like Logstash Grok.

Finds email addresses even when cleverly obfuscated in both english and hungarian

Search a string for PHP-like variables starting with $, containing an unlimited number of non-whitespace characters and ending with a word boundary of any kind