https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file Integer value zero, sometimes referred to as the ASCII NUL character. Characters whose integer representations are in the range from 1 through 31, except for alternate data streams where these characters are allowed. For more info...

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

capture Nth character from string, 3 times

Finds all source numbers in square brackets

Extract resource location, name and query parameters from a URL

This pulls out all the fields from a standard xferlog format log. Format specified here http://www.castaglia.org/proftpd/doc/xferlog.html

improved "Ahmed Z" regexp. PHP date format (and input[type=text] format date too): YYYY-MM-DD. Year between [1900-2099]. No leap year check. Month 02 is limited to 29 days.

This regex fetch only the data between content in curly braces (first occurrence, use preg_match_all in php, for all occurrences). This is useful for bad JSON files with wrong format or text between.

must match: selection/nl/example.xml selection/example.xml selection/blabla.txt selection/es/ ...

This is an improvement of the very good tH9mQ1/1. It did not pickup on the first two postcodes found here: //http://en.wikipedia.org/wiki/Postcodes_in_the_United_Kingdom

youtube id 17 matches

Validates a date with ISO 8601 format. Source: http://www.pelagodesign.com/blog/2009/05/20/iso-8601-date-validation-that-doesnt-suck/

Finds the protocol, subdomain, ((domain, extension)/ipaddress), port, filepath (split in path and filename), the route and the query string.