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\p{Lc}
fails to compile, but should be equal to \p{Cased_Letter}
#965
Comments
Thanks for the report. This is a duplicate of #835, although that's only about the With respect to Popping up a level, what are you hoping to achieve with the
Could you please say what you gave that impression? I'd love to fix it, because it is most certainly not true.
Again, this is intentional and it is even explicitly documented in the Unicode support documentation:
Indeed, it is actually ECMAScript that does not follow UTS #18. |
That is what I assumed, and it makes perfect sense since a surrogate is not a Unicode scalar value. I just noticed it because I iterated over all General Categories to see which are supported by
Nothing. I just needed to know which properties are supported, so I can emit an error in Pomsky when an unsupported property is used. Unicode support in Pomsky is slightly broken at the moment, which I intend to fix in the next release.
The syntax just looks similar, but upon second thought there aren't that many similarities. I think what animated this statement was my realization that Rust and ECMAScript support almost the same set of Unicode properties and use the same syntax to match them. |
Ah yeah, most regex flavors are quite similar, but can diverge in interesting and surprising ways. Some are definitely more similar than others.
Yeah, the key there is the common inspiration: UTS#18. |
I'm going to close this because I think the |
@BurntSushi I found another one: |
\p{Sc}
fails to compile\p{Lc}
fails to compile, but should be equal to \p{Cased_Letter}
This is more similar to the \p{Cf} bug than the \p{Sc} bug, but basically, 'lc' is an abbreviation for both 'Cased_Letter' and 'Lowercase_Mapping'. Since we don't support the latter (currently), we make 'lc' map to 'Cased_Letter'. If we do ever add 'Lowercase_Mapping' in the future, then we will just require users to type out its full form. Fixes #965
Nice find! I have a fix incoming for that now too. The main issue is that |
This is more similar to the \p{Cf} bug than the \p{Sc} bug, but basically, 'lc' is an abbreviation for both 'Cased_Letter' and 'Lowercase_Mapping'. Since we don't support the latter (currently), we make 'lc' map to 'Cased_Letter'. If we do ever add 'Lowercase_Mapping' in the future, then we will just require users to type out its full form. Fixes #965
This is more similar to the \p{Cf} bug than the \p{Sc} bug, but basically, 'lc' is an abbreviation for both 'Cased_Letter' and 'Lowercase_Mapping'. Since we don't support the latter (currently), we make 'lc' map to 'Cased_Letter'. If we do ever add 'Lowercase_Mapping' in the future, then we will just require users to type out its full form. Fixes #965
This is more similar to the \p{Cf} bug than the \p{Sc} bug, but basically, 'lc' is an abbreviation for both 'Cased_Letter' and 'Lowercase_Mapping'. Since we don't support the latter (currently), we make 'lc' map to 'Cased_Letter'. If we do ever add 'Lowercase_Mapping' in the future, then we will just require users to type out its full form. Fixes #965
This is more similar to the \p{Cf} bug than the \p{Sc} bug, but basically, 'lc' is an abbreviation for both 'Cased_Letter' and 'Lowercase_Mapping'. Since we don't support the latter (currently), we make 'lc' map to 'Cased_Letter'. If we do ever add 'Lowercase_Mapping' in the future, then we will just require users to type out its full form. Fixes #965
1.8.0 (2023-04-20) ================== This is a sizeable release that will be soon followed by another sizeable release. Both of them will combined close over 40 existing issues and PRs. This first release, despite its size, essentially represent preparatory work for the second release, which will be even bigger. Namely, this release: * Increases the MSRV to Rust 1.60.0, which was released about 1 year ago. * Upgrades its dependency on `aho-corasick` to the recently release 1.0 version. * Upgrades its dependency on `regex-syntax` to the simultaneously released `0.7` version. The changes to `regex-syntax` principally revolve around a rewrite of its literal extraction code and a number of simplifications and optimizations to its high-level intermediate representation (HIR). The second release, which will follow ~shortly after the release above, will contain a soup-to-nuts rewrite of every regex engine. This will be done by bringing [`regex-automata`](https://github.com/BurntSushi/regex-automata) into this repository, and then changing the `regex` crate to be nothing but an API shim layer on top of `regex-automata`'s API. These tandem releases are the culmination of about 3 years of on-and-off work that [began in earnest in March 2020](#656). Because of the scale of changes involved in these releases, I would love to hear about your experience. Especially if you notice undocumented changes in behavior or performance changes (positive *or* negative). Most changes in the first release are listed below. For more details, please see the commit log, which reflects a linear and decently documented history of all changes. New features: * [FEATURE #501](#501): Permit many more characters to be escaped, even if they have no significance. More specifically, any ASCII character except for `[0-9A-Za-z<>]` can now be escaped. Also, a new routine, `is_escapeable_character`, has been added to `regex-syntax` to query whether a character is escapeable or not. * [FEATURE #547](#547): Add `Regex::captures_at`. This filles a hole in the API, but doesn't otherwise introduce any new expressive power. * [FEATURE #595](#595): Capture group names are now Unicode-aware. They can now begin with either a `_` or any "alphabetic" codepoint. After the first codepoint, subsequent codepoints can be any sequence of alpha-numeric codepoints, along with `_`, `.`, `[` and `]`. Note that replacement syntax has not changed. * [FEATURE #810](#810): Add `Match::is_empty` and `Match::len` APIs. * [FEATURE #905](#905): Add an `impl Default for RegexSet`, with the default being the empty set. * [FEATURE #908](#908): A new method, `Regex::static_captures_len`, has been added which returns the number of capture groups in the pattern if and only if every possible match always contains the same number of matching groups. * [FEATURE #955](#955): Named captures can now be written as `(?<name>re)` in addition to `(?P<name>re)`. * FEATURE: `regex-syntax` now supports empty character classes. * FEATURE: `regex-syntax` now has an optional `std` feature. (This will come to `regex` in the second release.) * FEATURE: The `Hir` type in `regex-syntax` has had a number of simplifications made to it. * FEATURE: `regex-syntax` has support for a new `R` flag for enabling CRLF mode. This will be supported in `regex` proper in the second release. * FEATURE: `regex-syntax` now has proper support for "regex that never matches" via `Hir::fail()`. * FEATURE: The `hir::literal` module of `regex-syntax` has been completely re-worked. It now has more documentation, examples and advice. * FEATURE: The `allow_invalid_utf8` option in `regex-syntax` has been renamed to `utf8`, and the meaning of the boolean has been flipped. Performance improvements: * PERF: The upgrade to `aho-corasick 1.0` may improve performance in some cases. It's difficult to characterize exactly which patterns this might impact, but if there are a small number of longish (>= 4 bytes) prefix literals, then it might be faster than before. Bug fixes: * [BUG #514](#514): Improve `Debug` impl for `Match` so that it doesn't show the entire haystack. * BUGS [#516](#516), [#731](#731): Fix a number of issues with printing `Hir` values as regex patterns. * [BUG #610](#610): Add explicit example of `foo|bar` in the regex syntax docs. * [BUG #625](#625): Clarify that `SetMatches::len` does not (regretably) refer to the number of matches in the set. * [BUG #660](#660): Clarify "verbose mode" in regex syntax documentation. * BUG [#738](#738), [#950](#950): Fix `CaptureLocations::get` so that it never panics. * [BUG #747](#747): Clarify documentation for `Regex::shortest_match`. * [BUG #835](#835): Fix `\p{Sc}` so that it is equivalent to `\p{Currency_Symbol}`. * [BUG #846](#846): Add more clarifying documentation to the `CompiledTooBig` error variant. * [BUG #854](#854): Clarify that `regex::Regex` searches as if the haystack is a sequence of Unicode scalar values. * [BUG #884](#884): Replace `__Nonexhaustive` variants with `#[non_exhaustive]` attribute. * [BUG #893](#893): Optimize case folding since it can get quite slow in some pathological cases. * [BUG #895](#895): Reject `(?-u:\W)` in `regex::Regex` APIs. * [BUG #942](#942): Add a missing `void` keyword to indicate "no parameters" in C API. * [BUG #965](#965): Fix `\p{Lc}` so that it is equivalent to `\p{Cased_Letter}`. * [BUG #975](#975): Clarify documentation for `\pX` syntax.
1.8.0 (2023-04-20) ================== This is a sizeable release that will be soon followed by another sizeable release. Both of them will combined close over 40 existing issues and PRs. This first release, despite its size, essentially represent preparatory work for the second release, which will be even bigger. Namely, this release: * Increases the MSRV to Rust 1.60.0, which was released about 1 year ago. * Upgrades its dependency on `aho-corasick` to the recently release 1.0 version. * Upgrades its dependency on `regex-syntax` to the simultaneously released `0.7` version. The changes to `regex-syntax` principally revolve around a rewrite of its literal extraction code and a number of simplifications and optimizations to its high-level intermediate representation (HIR). The second release, which will follow ~shortly after the release above, will contain a soup-to-nuts rewrite of every regex engine. This will be done by bringing [`regex-automata`](https://github.com/BurntSushi/regex-automata) into this repository, and then changing the `regex` crate to be nothing but an API shim layer on top of `regex-automata`'s API. These tandem releases are the culmination of about 3 years of on-and-off work that [began in earnest in March 2020](#656). Because of the scale of changes involved in these releases, I would love to hear about your experience. Especially if you notice undocumented changes in behavior or performance changes (positive *or* negative). Most changes in the first release are listed below. For more details, please see the commit log, which reflects a linear and decently documented history of all changes. New features: * [FEATURE #501](#501): Permit many more characters to be escaped, even if they have no significance. More specifically, any ASCII character except for `[0-9A-Za-z<>]` can now be escaped. Also, a new routine, `is_escapeable_character`, has been added to `regex-syntax` to query whether a character is escapeable or not. * [FEATURE #547](#547): Add `Regex::captures_at`. This filles a hole in the API, but doesn't otherwise introduce any new expressive power. * [FEATURE #595](#595): Capture group names are now Unicode-aware. They can now begin with either a `_` or any "alphabetic" codepoint. After the first codepoint, subsequent codepoints can be any sequence of alpha-numeric codepoints, along with `_`, `.`, `[` and `]`. Note that replacement syntax has not changed. * [FEATURE #810](#810): Add `Match::is_empty` and `Match::len` APIs. * [FEATURE #905](#905): Add an `impl Default for RegexSet`, with the default being the empty set. * [FEATURE #908](#908): A new method, `Regex::static_captures_len`, has been added which returns the number of capture groups in the pattern if and only if every possible match always contains the same number of matching groups. * [FEATURE #955](#955): Named captures can now be written as `(?<name>re)` in addition to `(?P<name>re)`. * FEATURE: `regex-syntax` now supports empty character classes. * FEATURE: `regex-syntax` now has an optional `std` feature. (This will come to `regex` in the second release.) * FEATURE: The `Hir` type in `regex-syntax` has had a number of simplifications made to it. * FEATURE: `regex-syntax` has support for a new `R` flag for enabling CRLF mode. This will be supported in `regex` proper in the second release. * FEATURE: `regex-syntax` now has proper support for "regex that never matches" via `Hir::fail()`. * FEATURE: The `hir::literal` module of `regex-syntax` has been completely re-worked. It now has more documentation, examples and advice. * FEATURE: The `allow_invalid_utf8` option in `regex-syntax` has been renamed to `utf8`, and the meaning of the boolean has been flipped. Performance improvements: * PERF: The upgrade to `aho-corasick 1.0` may improve performance in some cases. It's difficult to characterize exactly which patterns this might impact, but if there are a small number of longish (>= 4 bytes) prefix literals, then it might be faster than before. Bug fixes: * [BUG #514](#514): Improve `Debug` impl for `Match` so that it doesn't show the entire haystack. * BUGS [#516](#516), [#731](#731): Fix a number of issues with printing `Hir` values as regex patterns. * [BUG #610](#610): Add explicit example of `foo|bar` in the regex syntax docs. * [BUG #625](#625): Clarify that `SetMatches::len` does not (regretably) refer to the number of matches in the set. * [BUG #660](#660): Clarify "verbose mode" in regex syntax documentation. * BUG [#738](#738), [#950](#950): Fix `CaptureLocations::get` so that it never panics. * [BUG #747](#747): Clarify documentation for `Regex::shortest_match`. * [BUG #835](#835): Fix `\p{Sc}` so that it is equivalent to `\p{Currency_Symbol}`. * [BUG #846](#846): Add more clarifying documentation to the `CompiledTooBig` error variant. * [BUG #854](#854): Clarify that `regex::Regex` searches as if the haystack is a sequence of Unicode scalar values. * [BUG #884](#884): Replace `__Nonexhaustive` variants with `#[non_exhaustive]` attribute. * [BUG #893](#893): Optimize case folding since it can get quite slow in some pathological cases. * [BUG #895](#895): Reject `(?-u:\W)` in `regex::Regex` APIs. * [BUG #942](#942): Add a missing `void` keyword to indicate "no parameters" in C API. * [BUG #965](#965): Fix `\p{Lc}` so that it is equivalent to `\p{Cased_Letter}`. * [BUG #975](#975): Clarify documentation for `\pX` syntax.
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [regex](https://github.com/rust-lang/regex) | dependencies | minor | `1.7.3` -> `1.8.1` | --- ### Release Notes <details> <summary>rust-lang/regex</summary> ### [`v1.8.1`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#​181-2023-04-21) \================== This is a patch release that fixes a bug where a regex match could be reported where none was found. Specifically, the bug occurs when a pattern contains some literal prefixes that could be extracted *and* an optional word boundary in the prefix. Bug fixes: - [BUG #​981](rust-lang/regex#981): Fix a bug where a word boundary could interact with prefix literal optimizations and lead to a false positive match. ### [`v1.8.0`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#​180-2023-04-20) \================== This is a sizeable release that will be soon followed by another sizeable release. Both of them will combined close over 40 existing issues and PRs. This first release, despite its size, essentially represents preparatory work for the second release, which will be even bigger. Namely, this release: - Increases the MSRV to Rust 1.60.0, which was released about 1 year ago. - Upgrades its dependency on `aho-corasick` to the recently released 1.0 version. - Upgrades its dependency on `regex-syntax` to the simultaneously released `0.7` version. The changes to `regex-syntax` principally revolve around a rewrite of its literal extraction code and a number of simplifications and optimizations to its high-level intermediate representation (HIR). The second release, which will follow ~shortly after the release above, will contain a soup-to-nuts rewrite of every regex engine. This will be done by bringing [`regex-automata`](https://github.com/BurntSushi/regex-automata) into this repository, and then changing the `regex` crate to be nothing but an API shim layer on top of `regex-automata`'s API. These tandem releases are the culmination of about 3 years of on-and-off work that [began in earnest in March 2020](rust-lang/regex#656). Because of the scale of changes involved in these releases, I would love to hear about your experience. Especially if you notice undocumented changes in behavior or performance changes (positive *or* negative). Most changes in the first release are listed below. For more details, please see the commit log, which reflects a linear and decently documented history of all changes. New features: - [FEATURE #​501](rust-lang/regex#501): Permit many more characters to be escaped, even if they have no significance. More specifically, any ASCII character except for `[0-9A-Za-z<>]` can now be escaped. Also, a new routine, `is_escapeable_character`, has been added to `regex-syntax` to query whether a character is escapeable or not. - [FEATURE #​547](rust-lang/regex#547): Add `Regex::captures_at`. This filles a hole in the API, but doesn't otherwise introduce any new expressive power. - [FEATURE #​595](rust-lang/regex#595): Capture group names are now Unicode-aware. They can now begin with either a `_` or any "alphabetic" codepoint. After the first codepoint, subsequent codepoints can be any sequence of alpha-numeric codepoints, along with `_`, `.`, `[` and `]`. Note that replacement syntax has not changed. - [FEATURE #​810](rust-lang/regex#810): Add `Match::is_empty` and `Match::len` APIs. - [FEATURE #​905](rust-lang/regex#905): Add an `impl Default for RegexSet`, with the default being the empty set. - [FEATURE #​908](rust-lang/regex#908): A new method, `Regex::static_captures_len`, has been added which returns the number of capture groups in the pattern if and only if every possible match always contains the same number of matching groups. - [FEATURE #​955](rust-lang/regex#955): Named captures can now be written as `(?<name>re)` in addition to `(?P<name>re)`. - FEATURE: `regex-syntax` now supports empty character classes. - FEATURE: `regex-syntax` now has an optional `std` feature. (This will come to `regex` in the second release.) - FEATURE: The `Hir` type in `regex-syntax` has had a number of simplifications made to it. - FEATURE: `regex-syntax` has support for a new `R` flag for enabling CRLF mode. This will be supported in `regex` proper in the second release. - FEATURE: `regex-syntax` now has proper support for "regex that never matches" via `Hir::fail()`. - FEATURE: The `hir::literal` module of `regex-syntax` has been completely re-worked. It now has more documentation, examples and advice. - FEATURE: The `allow_invalid_utf8` option in `regex-syntax` has been renamed to `utf8`, and the meaning of the boolean has been flipped. Performance improvements: - PERF: The upgrade to `aho-corasick 1.0` may improve performance in some cases. It's difficult to characterize exactly which patterns this might impact, but if there are a small number of longish (>= 4 bytes) prefix literals, then it might be faster than before. Bug fixes: - [BUG #​514](rust-lang/regex#514): Improve `Debug` impl for `Match` so that it doesn't show the entire haystack. - BUGS [#​516](rust-lang/regex#516), [#​731](rust-lang/regex#731): Fix a number of issues with printing `Hir` values as regex patterns. - [BUG #​610](rust-lang/regex#610): Add explicit example of `foo|bar` in the regex syntax docs. - [BUG #​625](rust-lang/regex#625): Clarify that `SetMatches::len` does not (regretably) refer to the number of matches in the set. - [BUG #​660](rust-lang/regex#660): Clarify "verbose mode" in regex syntax documentation. - BUG [#​738](rust-lang/regex#738), [#​950](rust-lang/regex#950): Fix `CaptureLocations::get` so that it never panics. - [BUG #​747](rust-lang/regex#747): Clarify documentation for `Regex::shortest_match`. - [BUG #​835](rust-lang/regex#835): Fix `\p{Sc}` so that it is equivalent to `\p{Currency_Symbol}`. - [BUG #​846](rust-lang/regex#846): Add more clarifying documentation to the `CompiledTooBig` error variant. - [BUG #​854](rust-lang/regex#854): Clarify that `regex::Regex` searches as if the haystack is a sequence of Unicode scalar values. - [BUG #​884](rust-lang/regex#884): Replace `__Nonexhaustive` variants with `#[non_exhaustive]` attribute. - [BUG #​893](rust-lang/regex#893): Optimize case folding since it can get quite slow in some pathological cases. - [BUG #​895](rust-lang/regex#895): Reject `(?-u:\W)` in `regex::Regex` APIs. - [BUG #​942](rust-lang/regex#942): Add a missing `void` keyword to indicate "no parameters" in C API. - [BUG #​965](rust-lang/regex#965): Fix `\p{Lc}` so that it is equivalent to `\p{Cased_Letter}`. - [BUG #​975](rust-lang/regex#975): Clarify documentation for `\pX` syntax. </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:eyJjcmVhdGVkSW5WZXIiOiIzNS42MS4wIiwidXBkYXRlZEluVmVyIjoiMzUuNjYuMyIsInRhcmdldEJyYW5jaCI6ImRldmVsb3AifQ==--> Co-authored-by: cabr2-bot <cabr2.help@gmail.com> Co-authored-by: crapStone <crapstone01@gmail.com> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1874 Reviewed-by: crapStone <crapstone@noreply.codeberg.org> Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org> Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
What version of regex are you using?
1.7.1
Describe the bug at a high level.
The syntax of
regex
seems to follow the ECMAScript spec. Upon checking, I noticed that 3 General Categories are not supported that work in other regex engines:Surrogate
Cs
(abbreviation forSurrogate
)Sc
(abbreviation forCurrency_Symbol
)But while the lack of support for
Surrogate
may be intentional,\p{Sc}
should work, and does work when not abbreviated. It also works when prefixed withgc=
orGeneral_Category=
:\p{Currency_Symbol}
\p{Sc}
\p{gc=Sc}
\p{GC=Sc}
\p{General_Category=Sc}
This bug might be related to the
Script
/sc
property (e.g.\p{sc=Greek}
), which happens to have the same abbreviation as theCurrency_Symbol
General Category.I noticed that Unicode properties are case insensitive in regex, which is in violation of the ECMAScript spec. But since changing it would be a breaking change, it's probably not worth it.
What are the steps to reproduce the behavior?
Try to compile
\p{Sc}
What is the actual behavior?
What is the expected behavior?
It should work.
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