regex – My Bookmarks

Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript

https://regex101.com/account/all

BBEdit-TextWrangler Regular Expression Cheat-Sheet · GitHub

https://gist.github.com/ccstone/5385334

Working RegEx that fails in Perl find & replace one-liner – Stack Overflow

http://stackoverflow.com/questions/23718219/working-regex-that-fails-in-perl-find-replace-one-liner#comment36455103_23718318

RegexOne – Learn regular expressions with interactive examples

http://regexone.com/

RegExr: Learn, Build, & Test RegEx

http://www.regexr.com/

8 Regular Expressions You Should Know | Nettuts

http://net.tutsplus.com/tutorials/other/8-regular-expressions-you-should-know/