Description of problem:

The Java Provider section of the "Rules Development Guide" mentions that the pattern is "a regular expression pattern to match", however this is not accurate. pattern is not a general "regular expression"; it is a pattern that will be passed to createPattern(String, int, int, int).

The following section (Java Locations) contains the following:

More information about the possibilities of these patterns can be found in the official Java documentaion, which contain all the information for building these patterns in the createPattern(String, int, int, int) section.

Please update the "Java Provider" section to mention that the pattern is not a regular expression and is instead something that will be passed to createPattern(String, int, int, int).