That reminds me of /c
my $str = 'Fsih my test variable is fsihd or is it gfsih or gfsih
# 1111 2222 3333
my $substr = 'fsih';
my $regexp = qr/\Q$substr\E/;
my $replace = 'fish';
my $instance = 3; # 3rd
scalar $str =~ /\G.*?$regexp/gc
$str =~ s/\G(.*?)$regexp/$1$replace/;
The /c is needed in case there are less than $instance instances of the search string.
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