Substitution with s///

Hi Experts,

 I am using the s/// patern to substitute a source string with a target string.
I am getting the source string and the target string in 2 variables as below.
my $searchpattern = <STDIN>;
my $replacestring = <STDIN>;

I am looping through a file as below and trying to replace sourcepattern with replacestring as below and writing into another file.

foreach (<IN>){

      s/"$searchpattern"/"$replacestring"/;
      print OUT $line;
}

the above is not working when I am using the variables . It works if I replace(given directly the source and target strings) the above syntax as below.

foreach (<IN>){

      s/saw/was/;
      print OUT $line;
}


Please let me know where I am going wrong/ what is the correct way to do that.

Thanks in advance. I need this very urgently.
nmretdAsked:
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FishMongerCommented:
Try this:

chomp(my $searchpattern = <STDIN>);
chomp(my $replacestring = <STDIN>);

foreach (<IN>){

     s/$searchpattern/$replacestring/;
     print OUT $line;
}
0

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FishMongerCommented:
Oops, one more adjustment.  The regex is being applied to $_ but you're printing $line and $line is not being assigned.

foreach (<IN>){

     s/$searchpattern/$replacestring/;
     print OUT;
}
0
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