What the fuck?

In Ontario, Canada, license classes are combined on the drivers license. This regex will parse out individual classes from the combination.

Featch or Replace Folder tag data. hello Result: hello

http://regexone.com/problem/extracting_url_data

matches normal email addresses like example@gmail.com but also addresses with ip addresses like example@192.168.0.34 (not ipv6)

Urls ending with a specific domain

This regex represents the httpurl in BNF from rfc1738 (at topic 5). Reference:https://www.ietf.org/rfc/rfc1738.txt

https://en.wikipedia.org/wiki/List_of_postal_codes_in_Austria

This matches EU IBAN codes considering spaces here and there

Find all twitter bootstrap buttons with class "btn".