+or zero if the pattern doesn't match. If the flag
+.B STRF_PREFIX
+is passed,
+.B str_matchx
+returns true if it reaches the end of the target string before finding a
+mismatch \(en i.e., if the target string is a prefix of a string which
+might match the pattern. The function
+.B str_match
+is a convenient wrapper for
+.B str_matchx
+with a zero flags word, which is the normal case.