Extract URLs by regex

test_cases.txt

Welcome to RegExr 0.3b, an intuitive tool for learning, writing, and testing Regular Expressions. Key features include: 
www.google.com
* real time results: shows results as you type 
* code hinting: roll over your expression to see info on specific elements 
* detailed results: roll over a match to see details & view group info below 
* built in regex guide: double click entries to insert them into your expression 
* online & desktop: regexr.com or download the desktop version for Mac, Windows, or Linux 
* save your expressions: My Saved expressions are saved locally 
* search Comm https://google.us.edi?34535/534534?dfg=g&fg unity expressions and add your own 
* create Share Links to send your expressions to co-workers or link to them on Twitter or your blog [ex. http://RegExr.com?2rjl6] 

Built by gskinner.com with Flex 3 [adobe.com/go/flex] and Spelling Plus Library for text highlighting [gskinner.com/products/spl].

url_regex.md

source

Regex pattern:

[(http(s)?):\/\/(www\.)?a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)