Replacing a string containing a question mark

Question

This is my code:

$html = 'Is this a question? Maybe.';
$old = 'question?';
$new = 'reply?';

$html =~ s/$old/$new/g;
print $html; exit;

Output is:

Is this a reply?? Maybe.

Desired output:

Is this a reply? Maybe.

What am I doing wrong?

Answer 1

Use quotemeta to escape the ?:

$html = 'Is this a question? Maybe.';
$old = quotemeta 'question?';
$new = 'reply?';

$html =~ s/$old/$new/g;
print $html; exit;