Regex

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General

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

Regular-Expressions.info

Types

Guides

regex cheatsheet

https://news.ycombinator.com/item?id=6812953

Web tools

My Regex Tester - PHP PCRE with search and replace

regular expressions 101 — an online regex tester for javascript, php, pcre and python.
- http://regex101.com/?tour

RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Results update in real-time as you type. Roll over a match or expression for details. Save & share expressions with others. Explore the Library for help & examples. Undo & Redo with Ctrl-Z / Y. Search for & rate Community patterns.