Perl6 has grammars: https://docs.perl6.org/language/grammar_tutorial https://docs.perl6.org/language/grammar_tutorial (recursive regex with sane syntax), which

Perl6 has grammars: https://docs.perl6.org/language/grammar_tutorial https://docs.perl6.org/language/grammar_tutorial (recursive regex with sane syntax), which are much better than plain regex in many cases. Otherwise modern Perl5 is much more practical.