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Opinion...

#!/usr/bin/perl use strict; #use warnings; for my $regexp ( qr/^((a*)b|a*b?d)*c\2$/, qr/^(a*b?d|(a*)b)*c\2$/, qr/^((a*)b|a*b?d())*c\2$/, # NOTE these two fixed to work the way qr/^(?|a*b?d()|(a*)b)*c\1$/, # I think they should work ) { for my $string (qw( aabadcaa aababdcaa )) { print "\n$string\n$regexp\n"; print $string =~ /$regexp/ ? 'Yes' : 'No', "\n"; } } print <<END; This is perl 5, version 38, subversion 0 (v5.38.0) built for x86_64-li +nux-thread-multi END

Outputs:

aabadcaa (?^:^((a*)b|a*b?d)*c\2$) No aababdcaa (?^:^((a*)b|a*b?d)*c\2$) No aabadcaa (?^:^(a*b?d|(a*)b)*c\2$) Yes aababdcaa (?^:^(a*b?d|(a*)b)*c\2$) Yes aabadcaa (?^:^((a*)b|a*b?d())*c\2$) No aababdcaa (?^:^((a*)b|a*b?d())*c\2$) No aabadcaa (?^:^(?|a*b?d()|(a*)b)*c\1$) No aababdcaa (?^:^(?|a*b?d()|(a*)b)*c\1$) No This is perl 5, version 38, subversion 0 (v5.38.0) built for x86_64-li +nux-thread-multi

In reply to Re^2: Precise backreference semantics in Perl regular expressions by tybalt89
in thread Precise backreference semantics in Perl regular expressions by Gro-Tsen

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