use strict; 
use warnings;

my $str = 'A string with a "double quoted" string in it';
(my $quoted = $str) =~ s/\"/\\\"/g;

print "$str\n$quoted\n";

[download]

Prints:

A string with a "double quoted" string in it
A string with a \"double quoted\" string in it

[download]

Where's the problem?

DWIM is Perl's answer to Gödel

In reply to Re: I am having a problem with search and replace regarding " by GrandFather
in thread I am having a problem with search and replace regarding " by Anonymous Monk

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