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".

Find all inputs and buttons with class btn.