[edan]

I can vouch for re2 - if you need to run a lot of regexps, or run user-supplied regexps, or run non-trivial regexps on user-supplied arbitrary data, re2 will save your application from certain death if you use pcre. Google "catastrophic backtracking" if you don't believe me.

Also, even though it doesn't say that Russ uses it, he probably must one way or the other working at Google, I highly recommend another google code project - protobuf.