Seong-lae ChoREs
A regex specifies a Regular Language
Regular Expression Notion
Regular Expression Usages
Test
regex101: build, test, and debug regex
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET.
https://regex101.com/
English to RegEx
www.autoregex.xyz
https://www.autoregex.xyz/