Ok, I get the same result as you reported. Playing around with it, I had to add two additional backslashes to get it to work as desired (not sure why):

my $ext='c';
qx("perl -p -i.bak -e \"s/(\\\@Filetyp\\s*?:)/\\1$ext/\" ./path/test.c
+");
#                          ^^

[download]

(Note: I also had to specify an extension for the backup file.) This is on Windows; if your O/S is different, it may treat the backslashes differently.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re^3: perl one liner to replace matching string by Athanasius
in thread perl one liner to replace matching string by vinoth.ree

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