My previous test were using the pyre2 Python project, that wrap the Google RE2 library
in python as a re2 module and accept bytes as input. However the fb-re2
Python project is also offering a wrapping of the Google RE2 library in python
as a re2 module ans accept only unicode on python3. So we detect this
situation and convert thing to unicode when necessary.
We should consider using a rust wrapping for regexp handling. We needs regexps
in Rust anyway and this give use more control with less variants and more