Solved! 
use strict;
use warnings;
my $file;

foreach $file (@ARGV) {
    open (INFILE,"<$file") or die "Cannot open Input file\n";

    while (<INFILE>) {
        s!(?:^|\w*/|\.\./)[^\s,@;:]*(?<=/)([^\s,@;:]+?)(?=[\s,@;:]|$)!
+$1!g;
#        s!\.\.!!g;
        print "$_";
    }
    close INFILE;
}

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In reply to Re: Okay, I know why is it failing by tsk1979
in thread This regular expression has me stumped by tsk1979

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