You appear to be getting very confused between code and data.

Am I correct in understanding that you have a Perl script that is acting to modify a file that happens to contain text that is (or at least looks like) a Perl script?

The s/// operator is not the system() function. This remains true notwithstanding the fact that the text that it happens be acting on looks like a line of Perl code with a system() function in it.

The sequence \p in a Perl regular expression has a meaning (to do with Unicode).

In reply to Re^3: getting error messaeg while substitution by nobull
in thread getting error messaeg while substitution by Anonymous Monk

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