Character classes . any character except newline \w\d\s word, digit, whitespace \W\D\S not word, digit, whitespace [abc] any of a,…
https://www.debuggex.com/cheatsheet/regex/pcre https://remram44.github.io/regex-cheatsheet/regex.html http://whyjoseph.blogspot.com/2011/04/pcre-cheat-sheet-article-201102.html Character classes . any character except newline \w\d\s word, digit, whitespace \W\D\S not word, digit, whitespace [abc]…