So while testing a regexp for https://forum.sublimetext.com/t/makefile-syntax-highlighting-with-multiple-targets-patch/751/1 I came across something which makes Sublime crash.
^(^\t ]+(\s^\t ]+)?:(?!\=))\s*.*
works as intended. But when you change the ? before the : to a * it crashes Sublime.
Cannot confirm in 20100413. Must have been fixed.
I also tried this and it didn't crash. Does it crash for you on every file (i.e., including an empty buffer), or does it need to be something specific?