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grep: upgrade to regex-syntax 0.5

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This update brings with it many bug fixes:

  * Better error messages are printed overall. We also include
    explicit call out for unsupported features like backreferences
    and look-around.
  * Regexes like `\s*{` no longer emit incomprehensible errors.
  * Unicode escape sequences, such as `\u{..}` are now supported.

For the most part, this upgrade was done in a straight-forward way. We
resist the urge to refactor the `grep` crate, in anticipation of it
being rewritten anyway.

Note that we removed the `--fixed-strings` suggestion whenever a regex
syntax error occurs. In practice, I've found that it results in a lot of
false positives, and I believe that its use is not as paramount now that
regex parse errors are much more readable.

Closes #268, Closes #395, Closes #702, Closes #853
This commit is contained in:
Andrew Gallant
2018-03-13 20:38:50 -04:00
parent c2e97cd858
commit cd08707c7c
9 changed files with 152 additions and 159 deletions
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2
grep/Cargo.toml
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@@ -16,4 +16,4 @@ license = "Unlicense/MIT"
log = "0.4"
memchr = "2"
regex = "0.2.9"
regex-syntax = "0.4.0"
regex-syntax = "0.5.3"