ning.  In the
short form, the leading colon <code>:</code> is followed by zero or more "magic
signature" letters (which optionally is terminated by another colon <code>:</code>),
and the remainder is the pattern to match against the path.
The "magic signature" consists of ASCII symbols that are neither
alphanumeric, glob, regex special characters nor colon.
The optional colon that terminates the "magic signature" can be
omitted if the pattern begins with a character that does not belong to
"magic signature"