Add support for some regexes

[satabin]

In some scenario, it is interesting to extract textual data based on some regular expression. This can be an interesting fs2-data module that handles this with corner cases (e.g. when the match spans over several elements and/or chunks).

Using a non-backtracking regular expression implementation (such as re2) can help us leverage this problem in a streaming context.

This PhD thesis can be interesting in this context.