September 24, 2009 at 16:43How Opera is actively handling regexps
It is a typical backtracking regular expression engine, but does some tricks to avoid redundant backtracking
From the 10.00 release.
That's what these tricks are all about. See a simple example:
javascript: alert (/ (t +) {2} /. Test ('tt'));
IE6, IE8: true
Firefox: true
Safari: true
Chrome: true
Opera9: true
Opera10: false
Be on the alert,% username%.