There's no backslash in your string, which is why it doesn't find one. If you use warnings (as you should, especially as a beginner), it gives you a clue: 

$ perl -wE 'say "C:\username\Sources"'
Unrecognized escape \S passed through at -e line 1.
C:SernameSources

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The \ in the double-quoted strings have a special meaning. Use double backslash to in ""-literals to produce a backslash in the string.

Perl 6 - second systems done right

In reply to Re: search for '\' in perl by moritz
in thread search for '\' in perl by kumeperl

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