'RexPattern' intrinsic class. This class encapsulates a compiled regular expression pattern.

A RexPattern object can be passed to the regular expression functions (rexMatch, rexSearch, rexReplace) in place of a string pattern. Since compiling a regular expression takes a non-trivial amount of time, it's more efficient to compile a pattern to a RexPattern object if the same pattern will be used in multiple searches.

intrinsic class RexPattern :   Object