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Pattern Matching (Bash Reference Manual)
EmacsWiki: Regular Expression
Emacs regex. This is specifically for emacs use!
Regular expressions
Describes bash regex used in =~ operator, like: if [[ $str =~ _[a-z]+ ]]; then ...
Regular expressions
Describes bash regex used in =~ operator, like: if [[ $str =~ _[a-z]+ ]]; then ...
Bash Regex: How to Use Regex in a Shell Script
Describes bash regex used in =~ operator, like: if [[ $str =~ _[a-z]+ ]]; then ...
regex101: build, test, and debug regex
Describes STANDARD regular expressions, that generally work in languages: AWK, Java, Python, Go, Javascript, also possibly GREP BUT NOT emacs or bash
AutoRegex: Convert from English to RegEx with Natural Language Processing
how do i get emacs to use a sane syntax for regular expression? : emacs
RegEx Library
RegexLearn - Step by step, from zero to advanced.
Regex Crossword
RegExr: Learn, Build, & Test RegExRegExr: Learn, Build, & Test RegEx
regex101: build, test, and debug regexOnline regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
Online regex tester, debugger with highlighting for PHP, PCRE, Python, Golang and JavaScript.
Regular expressions quick reference
Regex Cheat Sheet
regex101: build, debug and share regex
Regex Tester
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript
i Hate Regex - The Regex Cheat Sheet
RegexOne - Learn Regular Expressions - Lesson 1: An Introduction, and the ABCs
RegexOne provides a set of interactive lessons and exercises to help you learn regular expressions
RegexOne - Learn Regular Expressions - Lesson 1: An Introduction, and the ABCs
Regular Expressions for Regular Folk
This is an experimental “book“ about regular expressions. It is largely visual and example-based, as opposed to most regex resources I found while I was learning. I also attempted to choose test cases that highlight some common gotchas. I think it'll be worth your time.