SlickEdit supports Brief, Perl, and UNIX regular expression syntaxes as well providing its own syntax (SlickEdit). Extensive documentation is available for each syntax in the form of expression charts and examples, which can be very useful to determine what regex will work for the job. Using these charts for reference in combination with the Regex Evaluator
will get you where you need to be quicker and more accurately with your regex searches.
See "regular expressions" in the Help for more information.