A regex can be difficult to parse, especially if it is very involved, but in Perl at least, there are ways to make it much easier ( using the /x modifier, for example : https://perldoc.perl.org/perlre#%2Fx-and-%2Fxx ). Comments and and having the regex itself be multiline can make things better, especially if you are creating a particularly complicated one.

Damian Conway highly recommends using the combo of 'xms' his Perl Best Practices Book ( https://www.oreilly.com/library/view/perl-best-practices/059... ).

The revised and considerably newer "Modern Perl Best Practices" video series on O'Reilly's learning platform is particularly good also ( https://www.oreilly.com/library/view/modern-perl-best/978149... ) - with lots of discussion of regexes.