I just discovered that you can crash savitar very easily by making a trigger which traps the regex pattern
foo)|bar
... then save the world file, quit savitar, double-click the world file, then choose
window->show events window
Savitar crashes.
Obviously the regex pattern is poorly formed (although the docs on exactly which flavor of regex savitar understands are lacking) - but screwy user input is no excuse for a crash.
Savitar should handle screwy regex patterns more gracefully than this.
In fact, it would be nice to have a little regex editor where you could paste some sample text to test matching.