Question

I need to process the string with regexp and change x->y if is number around.

String: 2x2x2 2x 2x2x 2x2x2x2x2

Regexp: s/([0-9])x([0-9])/$1y$2/g

my $string = "2x2x2 2x 2x2x 2x2x2x2x2";

$string =~ s/([0-9])x([0-9])/$1y$2/g;

print "$string\n";

I expect: 2y2y2 xx 2x 2y2x 2y2y2y2y2

But result: 2y2x2 2x 2y2x 2y2x2y2x2 (not all 2×2 changed)

What should I do?

Answer 1

Try the below regex:

s/(?<=\d)x(?=\d)/y/g