omitted if the pattern begins with a character that does not belong to
"magic signature" symbol set and is not a colon.
+
-In the long form, the leading colon `:` is followed by a open
+In the long form, the leading colon `:` is followed by an open
parenthesis `(`, a comma-separated list of zero or more "magic words",
and a close parentheses `)`, and the remainder is the pattern to match
against the path.