How about this
use strict;
use warnings;
use 5.010;
my $string = "CATATHAT";
my $regex = '\wAT';
say 0..9; #print ruler
say $string, "\n"; #print original string
while ($string =~ /$regex/gi) {
my $match_len = length($&);
my $start = length($`);
my $end = $start + $match_len - 1;
say "match: $& ", "start: $start ", "end: $end";
}
--output:--
0123456789
CATATHAT
match: CAT start: 0 end: 2
match: HAT start: 5 end: 7
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