both isAntPrefixedPattern() and isRegexPrefixedPattern have a length requirement for the pattern to be greater than 1 character in length. I think this is an error and should only require that the pattern be at least 1 character in length.

The code from the methods looks like

pattern.length() > HANDLER_PREFIX.length() + HANDLER_SUFFIX.length() + 1

I think that either the > should be >= or the + 1 should be removed.