Defines a regular expression, use the RegExpFactory#getDefaultInstance() to
get the "default" instance, and then just call: RegExp.match(String,String).
Match a regular expression against the object passed in using the specified regular expression
library, pre-defined library names can be found in: RegExpFactory.
grep
through a file, line by line, and determine what matches there are to the nominated
regular expression using the specified regular expression implementation.