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Another possibility:

>perl -wMstrict -le "for my $s (qw( B111 B111B111 B111B111B111 A111 A111A111 A111A111A111 A111B111 A111B111A111 A111B111A111B111 A111B111A111B111A111 B111A111 B111A111B111 B111A111B111A111 B111A111B111A111B111 B BB BBB A AA AAA BA BAB AB ABA xxx xx x), '', ) { local our $y_n; ()= $s =~ m{ ([AB]) (?{ $y_n = $^N eq 'A' ? 'yes' : 'no' }) }xmsg; if (defined $y_n) { printf qq{%3s: '%s' \n}, $y_n, $s; } else { warn qq{no A or B found in '$s'}; } } " no: 'B111' no: 'B111B111' no: 'B111B111B111' yes: 'A111' yes: 'A111A111' yes: 'A111A111A111' no: 'A111B111' yes: 'A111B111A111' no: 'A111B111A111B111' yes: 'A111B111A111B111A111' yes: 'B111A111' no: 'B111A111B111' yes: 'B111A111B111A111' no: 'B111A111B111A111B111' no: 'B' no: 'BB' no: 'BBB' yes: 'A' yes: 'AA' yes: 'AAA' yes: 'BA' no: 'BAB' no: 'AB' yes: 'ABA' no A or B found in 'xxx' at -e line 1. no A or B found in 'xx' at -e line 1. no A or B found in 'x' at -e line 1. no A or B found in '' at -e line 1.

Update: And allowing for the possibility of side-effects (e.g., the values in the  %xlat hash could be anonymous subroutine references) (note:  //p and  ${^MATCH} only available in Perl 5.10+):

>perl -wMstrict -le "my %xlat = qw(A yes B no); ;; my $set = join '', map quotemeta, keys %xlat; $set = qr{ [$set] }xms; ;; my $xlat_keys = join ' or ', keys %xlat; ;; for my $s (qw( B111 B111B111 B111B111B111 A111 A111A111 A111A111A111 A111B111 A111B111A111 A111B111A111B111 A111B111A111B111A111 B111A111 B111A111B111 B111A111B111A111 B111A111B111A111B111 B BB BBB A AA AAA BA BAB AB ABA xxx xx x), '', ) { local our $y_n; use re 'eval'; ()= $s =~ m{ $set (?{ $y_n = $xlat{${^MATCH}} }) }xmspg; if (defined $y_n) { printf qq{%3s: '%s' \n}, $y_n, $s; } else { warn qq{no $xlat_keys found in '$s'}; } } " no: 'B111' no: 'B111B111' no: 'B111B111B111' yes: 'A111' yes: 'A111A111' yes: 'A111A111A111' no: 'A111B111' yes: 'A111B111A111' no: 'A111B111A111B111' yes: 'A111B111A111B111A111' yes: 'B111A111' no: 'B111A111B111' yes: 'B111A111B111A111' no: 'B111A111B111A111B111' no: 'B' no: 'BB' no: 'BBB' yes: 'A' yes: 'AA' yes: 'AAA' yes: 'BA' no: 'BAB' no: 'AB' yes: 'ABA' no A or B found in 'xxx' at -e line 1. no A or B found in 'xx' at -e line 1. no A or B found in 'x' at -e line 1. no A or B found in '' at -e line 1.

In reply to Re: Change variable multiple times within a single string? by AnomalousMonk
in thread Change variable multiple times within a single string? by JTomb

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