This article points out a common problem and discusses some ways to avoid it, but http://swtch.com/~rsc/regexp/regexp1.html http://swtch.com/~rsc/regexp/regexp1

This article points out a common problem and discusses some ways to avoid it, but http://swtch.com/~rsc/regexp/regexp1.html http://swtch.com/~rsc/regexp/regexp1.html describes how to solve it.