A good run down and easy to read :-)
I add some links I find useful:
Cheat Sheet
Regex cheatsheet
A vast collection of solutions
Regex DB
Generate RegExes from input data
http://regex.inginf.units.it
Online Editors
Online regex tester and debugger
Regexper (My personal favorite <3)
RegExr: Learn, Nuild. & Test Regex
Visualize RegExes
Regulex: JavaScript Regular Expression Visualizer
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