https://pubs.opengroup.org/onlinepubs/007904975/functions/regexec.html
regcomp
https://www.regcomp.com/
Home | Regcomp
https://www.holoweb.net/~liam/bx/functions/entry-regcomp.html
Liam's BitchX Reference: BX: $regcomp() in category string
BitchX IRC client scripting function $regcomp() in category string
in categoryliamreferencebxstring