Unable to match a backslash inside system command

I will boil down my exact requirement to this: I should print out lines that do not contain semi-colon, backslash and closing parentheses. The following one -liner works fine.
Consider the following sample data:
But if I use the same one-liner inside a system() command in a script, backslash(\) will not be matched by the regex. Lines containing backslash will be printed out to out.txt.
This is quite puzzling! Even I tried putting backslash within \Q and \E and using reverse quotes and exec() instead of system command. Got the same results :(

re: Unable to match a backslash inside system command

try with 4 backslashes:

[\\\\);]

My thinking is that you have to escape two of them for the shell first, then you end up with [\\);] for perl to work with.

re: Unable to match a backslash inside system command

Yes, you are right. It worked :)

Thanks,
Nithin

re: Unable to match a backslash inside system command

ahhhh..... lucky guess then. You're welcome. Kind of odd though to use a perl script to run a perl one-liner from the shell. Why not just write it all in the perl script?

re: Unable to match a backslash inside system command

In my script I would be parsing hundreds of files. The input and output filenames would be variables. I prefer writing it all in the perl script, but used this approach to reduce few lines (open & close statements). Came across this issue and wanted to know why..