I am writing a script, which gets the two parts of a s/// operand as parameters "$search" and "$replace". $search is treated with qr// and works. But later I want to do a substitution like 
$value = s/$search/$replace/;

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This works fine, as long I have a string stored in $replace. But I need capturing and then it fails, it inserts a '$1' instead of the value. If I just do a 
m/$search/;
print $1;

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I get the desired result in '$1'.
I tried it with eval{} but had no luck.

Can anybody point me to the solution?

For example I want to find single digit numbers and give them a leading zero. These are embedded in a varying string. So it could be something like 

my $search = qr/No\s+(\d)$/;
my $replace = 'No 0$1';
$title =~ s/$search/$replace/;

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And it came to pass that in time the Great God Om spake unto Brutha, the Chosen One: "Psst!"
(Terry Pratchett, Small Gods)

In reply to Variable substitute and capturing by Brutha

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