Regular Expressions 101

Will return domain portion of a url: Example: http://www.jkrowlings.com/books Returns: www.jkrowlings.com

Includes resource strings, taken from here: https://gist.github.com/dperini/729294

Useful to expand links without a protocol header with a base url src="/bla/blubb" --> src="http:/foo.com/bla/blubb"

inspired by https://mathiasbynens.be/demo/url-regex and the pattern from @imme_emosol

I use this to match the first url present in a text message.

(http(s)?:\/\/) // http:// or https:// (([a-zA-Z0-9_\-])+(\.([a-zA-Z0-9_\-])+)+(:[1-9]+[0]*)?)(\/?| // basic url f.e. www.wp.pl with obligatory / at end ...

Find any url('~filename.jpg'). URL must contain tilde

soundclouds url in

soundcloud url in a link

Extracts the port from different possible forms of URL

this is the most perfect pattern I reach for url with query or anchor