iHateRegex
i Hate Regex is a regex cheat sheet that also explains the commonly used expressions so that you understand it. Stop hating and start learning.

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Categories: Regular Expressions
Tags: regex regular expressions

RegExr
Learn, build, & test Regular Expressions

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Categories: Regular Expressions
Tags: regular expressions regex

Rubular
Test regular expressions in Ruby as you write them

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Categories: Regular Expressions Ruby
Tags: regex regular expressions ruby test

Regex101
Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript.
Source: https://regex101.com

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Categories: Hosted by Wapps Regular Expressions
Tags: regex regular expressions