If I'm reading correctly that you want to replace all non-slash characters with the letter x, the easiest way would seem to be to use tr rather than a regex: 
$ perl -e '$foo = "/some/path/to/a/file"; $foo =~ tr|/|x|c; print "$fo
+o\n";'
/xxxx/xxxx/xx/x/xxxx

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In reply to Re: Selectively replacing characters inside a string by dsheroh
in thread Selectively replacing characters inside a string by markkawika

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