Close, but no cigar 
my $string = '\\\\\\a';
# Unprocessed: \\\a
# Should be:   \a
# Result:      \\a

[download]
my $string = '\\\\\\?';
# Unprocessed: \\\?
# Should be:   \?
# Result:      \\#

[download]

See my top-level reply for a solution.

In reply to Re^2: Replace only unescaped metachars by ikegami
in thread Replace only unescaped metachars by Anonymous Monk

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