D7910: rust-re2: add wrapper for calling Re2 from Rust

[durin42 (Augie Fackler)]

durin42 added a comment.


  In D7910#116208 <https://phab.mercurial-scm.org/D7910#116208>, @kevincox wrote:
  
  > Does mercurial currently use RE2? If not then can you explain why we don't just use the rust `regex` crate?
  
  We have support for using re2 iff the correct Python bindings are installed. That said, I thought the rust regex crate would be compatible with re2? If we can't use that, we should document why so that future hackers (like me) don't try and simplify....

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  rHG Mercurial

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  https://phab.mercurial-scm.org/D7910/new/

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  https://phab.mercurial-scm.org/D7910

To: Alphare, #hg-reviewers, kevincox
Cc: durin42, kevincox, mjpieters, mercurial-devel