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incorrect case for word boundaries #579
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I figured out how this bug occurs. Lines 704 to 716 in 9921922
However, a word boundary check cannot be done only with the substring. For example, when text = "a," and start = 1 then &text[start..] = "," but its index 0 (EOF for reverse matching) should be treated as a word boundary.
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@pcpthm, so how should we proceed? |
@sergeevabc I was not completely sure how to fix it and this is why I just commented on this issue and didn't write a fix. Line 1725 in a0f541b
eof Byte s where one returns true to .is_ascii_word() and other one returns false . Then, here Line 834 in a0f541b
eof depending on whether "text[-1] " is a word-byte or not (of course a slice cannot index at negative so we have to pass it as an additional argument). We have to account for the two kinds of EOF bytes for DFA table layouts e.g. Lines 1522 to 1525 in a0f541b
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This will be fixed as part of #656. |
I found a problem with This returns fn main() {
let re = regex::Regex::new(r"\b.").unwrap();
println!("{:?}", re.find_at("foo bar", 3));
} Playground: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=3892e7b72507f13b32a1110e94aee066 |
I usually close tickets on a commit-by-commit basis, but this refactor was so big that it wasn't feasible to do that. So ticket closures are marked here. Closes #244 Closes #259 Closes #476 Closes #644 Closes #675 Closes #824 Closes #961 Closes #68 Closes #510 Closes #787 Closes #891 Closes #429 Closes #517 Closes #579 Closes #779 Closes #850 Closes #921 Closes #976 Closes #1002 Closes #656
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [regex](https://github.com/rust-lang/regex) | dependencies | minor | `1.8.4` -> `1.9.1` | --- ### Release Notes <details> <summary>rust-lang/regex (regex)</summary> ### [`v1.9.1`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#191-2023-07-07) [Compare Source](rust-lang/regex@1.9.0...1.9.1) \================== This is a patch release which fixes a memory usage regression. In the regex 1.9 release, one of the internal engines used a more aggressive allocation strategy than what was done previously. This patch release reverts to the prior on-demand strategy. Bug fixes: - [BUG #​1027](rust-lang/regex#1027): Change the allocation strategy for the backtracker to be less aggressive. ### [`v1.9.0`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#190-2023-07-05) [Compare Source](rust-lang/regex@1.8.4...1.9.0) \================== This release marks the end of a [years long rewrite of the regex crate internals](rust-lang/regex#656). Since this is such a big release, please report any issues or regressions you find. We would also love to hear about improvements as well. In addition to many internal improvements that should hopefully result in "my regex searches are faster," there have also been a few API additions: - A new `Captures::extract` method for quickly accessing the substrings that match each capture group in a regex. - A new inline flag, `R`, which enables CRLF mode. This makes `.` match any Unicode scalar value except for `\r` and `\n`, and also makes `(?m:^)` and `(?m:$)` match after and before both `\r` and `\n`, respectively, but never between a `\r` and `\n`. - `RegexBuilder::line_terminator` was added to further customize the line terminator used by `(?m:^)` and `(?m:$)` to be any arbitrary byte. - The `std` Cargo feature is now actually optional. That is, the `regex` crate can be used without the standard library. - Because `regex 1.9` may make binary size and compile times even worse, a new experimental crate called `regex-lite` has been published. It prioritizes binary size and compile times over functionality (like Unicode) and performance. It shares no code with the `regex` crate. New features: - [FEATURE #​244](rust-lang/regex#244): One can opt into CRLF mode via the `R` flag. e.g., `(?mR:$)` matches just before `\r\n`. - [FEATURE #​259](rust-lang/regex#259): Multi-pattern searches with offsets can be done with `regex-automata 0.3`. - [FEATURE #​476](rust-lang/regex#476): `std` is now an optional feature. `regex` may be used with only `alloc`. - [FEATURE #​644](rust-lang/regex#644): `RegexBuilder::line_terminator` configures how `(?m:^)` and `(?m:$)` behave. - [FEATURE #​675](rust-lang/regex#675): Anchored search APIs are now available in `regex-automata 0.3`. - [FEATURE #​824](rust-lang/regex#824): Add new `Captures::extract` method for easier capture group access. - [FEATURE #​961](rust-lang/regex#961): Add `regex-lite` crate with smaller binary sizes and faster compile times. - [FEATURE #​1022](rust-lang/regex#1022): Add `TryFrom` implementations for the `Regex` type. Performance improvements: - [PERF #​68](rust-lang/regex#68): Added a one-pass DFA engine for faster capture group matching. - [PERF #​510](rust-lang/regex#510): Inner literals are now used to accelerate searches, e.g., `\w+@​\w+` will scan for `@`. - [PERF #​787](rust-lang/regex#787), [PERF #​891](rust-lang/regex#891): Makes literal optimizations apply to regexes of the form `\b(foo|bar|quux)\b`. (There are many more performance improvements as well, but not all of them have specific issues devoted to them.) Bug fixes: - [BUG #​429](rust-lang/regex#429): Fix matching bugs related to `\B` and inconsistencies across internal engines. - [BUG #​517](rust-lang/regex#517): Fix matching bug with capture groups. - [BUG #​579](rust-lang/regex#579): Fix matching bug with word boundaries. - [BUG #​779](rust-lang/regex#779): Fix bug where some regexes like `(re)+` were not equivalent to `(re)(re)*`. - [BUG #​850](rust-lang/regex#850): Fix matching bug inconsistency between NFA and DFA engines. - [BUG #​921](rust-lang/regex#921): Fix matching bug where literal extraction got confused by `$`. - [BUG #​976](rust-lang/regex#976): Add documentation to replacement routines about dealing with fallibility. - [BUG #​1002](rust-lang/regex#1002): Use corpus rejection in fuzz testing. </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNi4wLjAiLCJ1cGRhdGVkSW5WZXIiOiIzNi44LjExIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCJ9--> Co-authored-by: cabr2-bot <cabr2.help@gmail.com> Co-authored-by: crapStone <crapstone01@gmail.com> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1957 Reviewed-by: crapStone <crapstone01@gmail.com> Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org> Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
Here's a reproduction:
Actual output:
Expected output:
Playground link: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=55914c890dfb6a68fc72b9c6fd986298
The same bug is present even if we use ASCII word boundaries: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=eef23f309c9f608eb683aac982648301
Here's a smaller reproduction:
Playground link: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=c7507e4d095141004909f9deb1c6cdd7
Originally reported against ripgrep: BurntSushi/ripgrep#1275
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