Well, you could do something like this:
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}
However, you haven't defined what you mean by "metacharacters" or why you're trying to do this exactly, so I can't really supply a comprehensive solution. The "why" is especially important, since what people are asking for often isn't what's actually needed.
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