Current default is Contains which will use a Regexp incurring useless processing. Using Substring is more performant and seems more suitable in most cases
Date: Wed Dec 18 22:44:11 2013 New Revision: 1552140 URL: http://svn.apache.org/r1552140 Log: Bug 55908 - Response assertion : Change Pattern Matching Rules default to Substring on creation for better performances Bugzilla Id: 55908 Modified: jmeter/trunk/src/components/org/apache/jmeter/assertions/gui/AssertionGui.java jmeter/trunk/xdocs/changes.xml
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/3289