Regular expressions are not the way to do syntax highlighting yet many of the popular editors do it this way. Create a super huge string in vim, textmate or sublime text and watch it blow up. Then try it in Xcode or Intellij and see that there is no problem. The reason for Xcode and Intellij's fast syntax highlighting is because these do not use regular expressions, they use a lexer. They're examining the text one character at a time with some amount of forward and backward looking state and building the syntax highlighting and smart completion/features that way. As long as your editor is using regular expressions for syntax highlighting this will be a problem for you.
