use strict;
use warnings;

while (<DATA>) {
    chomp;
    s/^['"]+|['"]+$//g;    # Remove starting and ending quotes
    s/(['"{}])/\\$1/g;     # Escape appropriate characters
    print "$_\n";
}

__DATA__
"text with quotes"
If it ain't broke, don't fix it.
We all love {curly brackets}