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6a0e0147e0
When the -w/--word-regexp was used, ripgrep would in many cases fail to
apply literal optimizations. This occurs specifically when the regex
given by the user is an alternation of literals with no common prefixes
or suffixes, e.g.,
rg -w 'foo|bar|baz|quux'
In this case, the inner literal detector fails. Normally, this would
result in literal prefixes being detected by the regex engine. But
because of the -w/--word-regexp flag, the actual regex that we run ends
up looking like this:
(^|\W)(foo|bar|baz|quux)($|\W)
which of course defeats any prefix or suffix literal optimizations in
the regex crate's somewhat naive extractor. (A better extractor could
still do literal optimizations in the above case.)
So this commit fixes this by falling back to prefix or suffix literals
when they're available instead of prematurely giving up and assuming the
regex engine will do the rest.
grep-regex
The grep-regex crate provides an implementation of the Matcher trait from
the grep-matcher crate. This implementation permits Rust's regex engine to
be used in the grep crate for fast line oriented searching.
Dual-licensed under MIT or the UNLICENSE.
Documentation
NOTE: You probably don't want to use this crate directly. Instead, you
should prefer the facade defined in the
grep
crate.
Usage
Add this to your Cargo.toml:
[dependencies]
grep-regex = "0.1"
and this to your crate root:
extern crate grep_regex;