system("sed -ie 's/\(.*\)/Number => \1/' test.txt");
See the difference: 
say "sed -ie 's/\(.*\)/Number => \1/' test.txt";
say qq{sed -ie 's/\(.*\)/Number => \1/' test.txt};
say q{sed -ie 's/\(.*\)/Number => \1/' test.txt};
__END__
sed -ie 's/(.*)/Number => /' test.txt
sed -ie 's/(.*)/Number => /' test.txt
sed -ie 's/\(.*\)/Number => \1/' test.txt

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Double quotes do interpolate your backslashes, and they are lost when you run the command. You need a non-interpolating quote operator instead to pass your string unchanded to the shell.

And I strongly advice you to use native Perl code instead, too.

Sorry if my advice was wrong.

In reply to Re: sed isn't working within a perl script by aitap
in thread sed isn't working within a perl script by nvivek

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