Bug 57032 - Make regexes in HTTP Script Recorder more useful.

When a regex starts and ends with a paren, it will not be surrounded
by boundary matchers anymore. That way boundary characters can be
included in the match.

Bugzilla Id: 57032


git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1629926 13f79535-47bb-0310-9956-ffa450edef68