Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

-w/--word-regexp sometimes returns odd results #2623

Closed
BurntSushi opened this issue Oct 10, 2023 · 0 comments
Closed

-w/--word-regexp sometimes returns odd results #2623

BurntSushi opened this issue Oct 10, 2023 · 0 comments
Labels
bug A bug. rollup A PR that has been merged with many others in a rollup.

Comments

@BurntSushi
Copy link
Owner

It turns out that ripgrep's -w/--word-regexp flag doesn't quite do what it claims to. And as a result, it actually differs from GNU grep in some cases (and even with PCRE2 within ripgrep):

$ echo '###' | grep -w -o .
#
#
#
$ echo '###' | rg-13.0.0 -w -o .
#
#
$ echo '###' | rg-13.0.0 -P -w -o .
#
#
#

ripgrep 14 will fix this:

$ echo '###' | rg-14.0.0 -w -o .
#
#
#

The actual issue here is that ripgrep used a hacky work-around to implement -w/--word-regexp that just didn't work right in all cases. For PCRE2, it was implemented via look-around assertions that always got it right:

} else if self.word {
// We make this option exclusive with whole_line because when
// whole_line is enabled, all matches necessary fall on word
// boundaries. So this extra goop is strictly redundant.
singlepat = format!(r"(?<!\w)(?:{})(?!\w)", singlepat);
}

The work-around I used basically tried to emulate look-around with capture groups. And while it works in a lot of cases, it doesn't work in all of them. I spent quite a bit of time trying to figure out how to fix the work-around once and for all, but couldn't see a way to make the code obviously correct. Instead, I just added support for \b{start-half} and \b{end-half} word boundary assertions that do exactly what the look-around does in PCRE2. See: rust-lang/regex#469

@BurntSushi BurntSushi added bug A bug. rollup A PR that has been merged with many others in a rollup. labels Oct 10, 2023
BurntSushi added a commit that referenced this issue Oct 10, 2023
This was fixed a few commits ago when we updated to regex-automata 0.4
(regex 1.10).

Fixes #2623
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this issue Nov 28, 2023
14.0.2 (2023-11-27)
===================
This is a patch release with a few small bug fixes.

Bug fixes:

* [BUG #2654](BurntSushi/ripgrep#2654):
  Fix `deb` release sha256 sum file.
* [BUG #2658](BurntSushi/ripgrep#2658):
  Fix partial regression in the behavior of `--null-data --line-regexp`.
* [BUG #2659](BurntSushi/ripgrep#2659):
  Fix Fish shell completions.
* [BUG #2662](BurntSushi/ripgrep#2662):
  Fix typo in documentation for `-i/--ignore-case`.


14.0.1 (2023-11-26)
===================
This a patch release meant to fix `cargo install ripgrep` on Windows.

Bug fixes:

* [BUG #2653](BurntSushi/ripgrep#2653):
  Include `pkg/windows/Manifest.xml` in crate package.


14.0.0 (2023-11-26)
===================
ripgrep 14 is a new major version release of ripgrep that has some new
features, performance improvements and a lot of bug fixes.

The headlining feature in this release is hyperlink support. In this release,
they are an opt-in feature but may change to an opt-out feature in the future.
To enable them, try passing `--hyperlink-format default`. If you use [VS Code],
then try passing `--hyperlink-format vscode`. Please [report your experience
with hyperlinks][report-hyperlinks], positive or negative.

[VS Code]: https://code.visualstudio.com/
[report-hyperlinks]: BurntSushi/ripgrep#2611

Another headlining development in this release is that it contains a rewrite
of its regex engine. You generally shouldn't notice any changes, except for
some searches may get faster. You can read more about the [regex engine rewrite
on my blog][regex-internals]. Please [report your performance improvements or
regressions that you notice][report-perf].

[report-perf]: BurntSushi/ripgrep#2652

Finally, ripgrep switched the library it uses for argument parsing. Users
should not notice a difference in most cases (error messages have changed
somewhat), but flag overrides should generally be more consistent. For example,
things like `--no-ignore --ignore-vcs` work as one would expect (disables all
filtering related to ignore rules except for rules found in version control
systems such as `git`).

[regex-internals]: https://blog.burntsushi.net/regex-internals/

**BREAKING CHANGES**:

* `rg -C1 -A2` used to be equivalent to `rg -A2`, but now it is equivalent to
  `rg -B1 -A2`. That is, `-A` and `-B` no longer completely override `-C`.
  Instead, they only partially override `-C`.

Build process changes:

* ripgrep's shell completions and man page are now created by running ripgrep
with a new `--generate` flag. For example, `rg --generate man` will write a
man page in `roff` format on stdout. The release archives have not changed.
* The optional build dependency on `asciidoc` or `asciidoctor` has been
dropped. Previously, it was used to produce ripgrep's man page. ripgrep now
owns this process itself by writing `roff` directly.

Performance improvements:

* [PERF #1746](BurntSushi/ripgrep#1746):
  Make some cases with inner literals faster.
* [PERF #1760](BurntSushi/ripgrep#1760):
  Make most searches with `\b` look-arounds (among others) much faster.
* [PERF #2591](BurntSushi/ripgrep#2591):
  Parallel directory traversal now uses work stealing for faster searches.
* [PERF #2642](BurntSushi/ripgrep#2642):
  Parallel directory traversal has some contention reduced.

Feature enhancements:

* Added or improved file type filtering for Ada, DITA, Elixir, Fuchsia, Gentoo,
  Gradle, GraphQL, Markdown, Prolog, Raku, TypeScript, USD, V
* [FEATURE #665](BurntSushi/ripgrep#665):
  Add a new `--hyperlink-format` flag that turns file paths into hyperlinks.
* [FEATURE #1709](BurntSushi/ripgrep#1709):
  Improve documentation of ripgrep's behavior when stdout is a tty.
* [FEATURE #1737](BurntSushi/ripgrep#1737):
  Provide binaries for Apple silicon.
* [FEATURE #1790](BurntSushi/ripgrep#1790):
  Add new `--stop-on-nonmatch` flag.
* [FEATURE #1814](BurntSushi/ripgrep#1814):
  Flags are now categorized in `-h/--help` output and ripgrep's man page.
* [FEATURE #1838](BurntSushi/ripgrep#1838):
  An error is shown when searching for NUL bytes with binary detection enabled.
* [FEATURE #2195](BurntSushi/ripgrep#2195):
  When `extra-verbose` mode is enabled in zsh, show extra file type info.
* [FEATURE #2298](BurntSushi/ripgrep#2298):
  Add instructions for installing ripgrep using `cargo binstall`.
* [FEATURE #2409](BurntSushi/ripgrep#2409):
  Added installation instructions for `winget`.
* [FEATURE #2425](BurntSushi/ripgrep#2425):
  Shell completions (and man page) can be created via `rg --generate`.
* [FEATURE #2524](BurntSushi/ripgrep#2524):
  The `--debug` flag now indicates whether stdin or `./` is being searched.
* [FEATURE #2643](BurntSushi/ripgrep#2643):
  Make `-d` a short flag for `--max-depth`.
* [FEATURE #2645](BurntSushi/ripgrep#2645):
  The `--version` output will now also contain PCRE2 availability information.

Bug fixes:

* [BUG #884](BurntSushi/ripgrep#884):
  Don't error when `-v/--invert-match` is used multiple times.
* [BUG #1275](BurntSushi/ripgrep#1275):
  Fix bug with `\b` assertion in the regex engine.
* [BUG #1376](BurntSushi/ripgrep#1376):
  Using `--no-ignore --ignore-vcs` now works as one would expect.
* [BUG #1622](BurntSushi/ripgrep#1622):
  Add note about error messages to `-z/--search-zip` documentation.
* [BUG #1648](BurntSushi/ripgrep#1648):
  Fix bug where sometimes short flags with values, e.g., `-M 900`, would fail.
* [BUG #1701](BurntSushi/ripgrep#1701):
  Fix bug where some flags could not be repeated.
* [BUG #1757](BurntSushi/ripgrep#1757):
  Fix bug when searching a sub-directory didn't have ignores applied correctly.
* [BUG #1891](BurntSushi/ripgrep#1891):
  Fix bug when using `-w` with a regex that can match the empty string.
* [BUG #1911](BurntSushi/ripgrep#1911):
  Disable mmap searching in all non-64-bit environments.
* [BUG #1966](BurntSushi/ripgrep#1966):
  Fix bug where ripgrep can panic when printing to stderr.
* [BUG #2046](BurntSushi/ripgrep#2046):
  Clarify that `--pre` can accept any kind of path in the documentation.
* [BUG #2108](BurntSushi/ripgrep#2108):
  Improve docs for `-r/--replace` syntax.
* [BUG #2198](BurntSushi/ripgrep#2198):
  Fix bug where `--no-ignore-dot` would not ignore `.rgignore`.
* [BUG #2201](BurntSushi/ripgrep#2201):
  Improve docs for `-r/--replace` flag.
* [BUG #2288](BurntSushi/ripgrep#2288):
  `-A` and `-B` now only each partially override `-C`.
* [BUG #2236](BurntSushi/ripgrep#2236):
  Fix gitignore parsing bug where a trailing `\/` resulted in an error.
* [BUG #2243](BurntSushi/ripgrep#2243):
  Fix `--sort` flag for values other than `path`.
* [BUG #2246](BurntSushi/ripgrep#2246):
  Add note in `--debug` logs when binary files are ignored.
* [BUG #2337](BurntSushi/ripgrep#2337):
  Improve docs to mention that `--stats` is always implied by `--json`.
* [BUG #2381](BurntSushi/ripgrep#2381):
  Make `-p/--pretty` override flags like `--no-line-number`.
* [BUG #2392](BurntSushi/ripgrep#2392):
  Improve global git config parsing of the `excludesFile` field.
* [BUG #2418](BurntSushi/ripgrep#2418):
  Clarify sorting semantics of `--sort=path`.
* [BUG #2458](BurntSushi/ripgrep#2458):
  Make `--trim` run before `-M/--max-columns` takes effect.
* [BUG #2479](BurntSushi/ripgrep#2479):
  Add documentation about `.ignore`/`.rgignore` files in parent directories.
* [BUG #2480](BurntSushi/ripgrep#2480):
  Fix bug when using inline regex flags with `-e/--regexp`.
* [BUG #2505](BurntSushi/ripgrep#2505):
  Improve docs for `--vimgrep` by mentioning footguns and some work-arounds.
* [BUG #2519](BurntSushi/ripgrep#2519):
  Fix incorrect default value in documentation for `--field-match-separator`.
* [BUG #2523](BurntSushi/ripgrep#2523):
  Make executable searching take `.com` into account on Windows.
* [BUG #2574](BurntSushi/ripgrep#2574):
  Fix bug in `-w/--word-regexp` that would result in incorrect match offsets.
* [BUG #2623](BurntSushi/ripgrep#2623):
  Fix a number of bugs with the `-w/--word-regexp` flag.
* [BUG #2636](BurntSushi/ripgrep#2636):
  Strip release binaries for macOS.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
bug A bug. rollup A PR that has been merged with many others in a rollup.
Projects
None yet
Development

No branches or pull requests

1 participant