This release fixes another compilation failure when building regex. This time, the fix is for when the pattern feature is enabled, which only works on nightly Rust. CI has been updated to test this case.
pattern feature is enabled.This releases fixes a bug when building regex with only the unicode-perl feature. It turns out that while CI was building this configuration, it wasn't actually failing the overall build on a failed compilation.
regex-syntax when only the unicode-perl feature is enabled.This release fixes a performance bug when Unicode word boundaries are used. Namely, for certain regexes on certain inputs, it‘s possible for the lazy DFA to stop searching (causing a fallback to a slower engine) when it doesn’t actually need to.
PR #768 fixes the bug, which was originally reported in ripgrep#1860.
This is a patch release that fixes a compilation error when the perf-literal feature is not enabled.
This release primarily updates to Rust 2018 (finally) and bumps the MSRV to Rust 1.41 (from Rust 1.28). Rust 1.41 was chosen because it‘s still reasonably old, and is what’s in Debian stable at the time of writing.
This release also drops this crate's own bespoke substring search algorithms in favor of a new memmem implementation provided by the memchr crate. This will change the performance profile of some regexes, sometimes getting a little worse, and hopefully more frequently, getting a lot better. Please report any serious performance regressions if you find them.
This is a small patch release that fixes the compiler‘s size check on how much heap memory a regex uses. Previously, the compiler did not account for the heap usage of Unicode character classes. Now it does. It’s possible that this may make some regexes fail to compile that previously did compile. If that happens, please file an issue.
This is a small patch release that fixes a regression in the size of a Regex in the 1.4.4 release. Prior to 1.4.4, a Regex was 552 bytes. In the 1.4.4 release, it was 856 bytes due to internal changes. In this release, a Regex is now 16 bytes. In general, the size of a Regex was never something that was on my radar, but this increased size in the 1.4.4 release seems to have crossed a threshold and resulted in stack overflows in some programs.
Regex size by decreasing its size.This is a small patch release that contains some bug fixes. Notably, it also drops the thread_local (and lazy_static, via transitivity) dependencies.
Bug fixes:
UnwindSafe and RefUnwindSafe.Replacer impls for Vec<u8>, String, Cow, etc.This is a small patch release that adds some missing standard trait implementations for some types in the public API.
Bug fixes:
FusedIterator and ExactSizeIterator impls to iterator types.Debug impls to public API types.This is a small bug fix release that bans \P{any}. We previously banned empty classes like [^\w\W], but missed the \P{any} case. In the future, we hope to permit empty classes.
\P{any} to avoid a panic in the regex compiler. Found by OSS-Fuzz.This is a small bug fix release that makes \p{cf} work. Previously, it would report “property not found” even though cf is a valid abbreviation for the Format general category.
\p{cf} from working.This releases has a few minor documentation fixes as well as some very minor API additions. The MSRV remains at Rust 1.28 for now, but this is intended to increase to at least Rust 1.41.1 soon.
This release also adds support for OSS-Fuzz. Kudos to @DavidKorczynski for doing the heavy lifting for that!
New features:
[, ] and . in capture group names.is_empty predicate to RegexSet.Clone for SubCaptureMatches.empty constructor to RegexSet for convenience.Bug fixes:
Replacer::replace_append.s flag when using a bytes::Regex.is_match docs to indicate that it can match anywhere in string.This release fixes a MSRV (Minimum Support Rust Version) regression in the 1.3.8 release. Namely, while 1.3.8 compiles on Rust 1.28, it actually does not compile on other Rust versions, such as Rust 1.39.
Bug fixes:
doc_comment crate, which cannot be used before Rust 1.43.This release contains a couple of important bug fixes driven by better support for empty-subexpressions in regexes. For example, regexes like b| are now allowed. Major thanks to @sliquister for implementing support for this in #677.
Bug fixes:
x mode.This release contains a small bug fix that fixes how regex forwards crate features to regex-syntax. In particular, this will reduce recompilations in some cases.
Bug fixes:
regex-syntax.This release contains a sizable (~30%) performance improvement when compiling some kinds of large regular expressions.
Performance improvements:
This release updates this crate to Unicode 13.
New features:
regex-syntax to Unicode 13.This is a small bug fix release that fixes a bug related to the scoping of flags in a regex. Namely, before this fix, a regex like ((?i)a)b) would match aB despite the fact that b should not be matched case insensitively.
Bug fixes:
This is a small maintenance release that upgrades the dependency on thread_local from 0.3 to 1.0. The minimum supported Rust version remains at Rust 1.28.
This is a small maintenance release with some house cleaning and bug fixes.
New features:
Match::range method an a From<Match> for Range impl.Bug fixes:
/-/.splitn("a", 2) to return ["a"] instead of ["a", ""].\p\./-/.split("a-") to return ["a", ""] instead of ["a"].std::error::Error::description method.This is a maintenance release with no changes in order to try to work-around a docs.rs/Cargo issue.
This release adds a plethora of new crate features that permit users of regex to shrink its size considerably, in exchange for giving up either functionality (such as Unicode support) or runtime performance. When all such features are disabled, the dependency tree for regex shrinks to exactly 1 crate (regex-syntax). More information about the new crate features can be found in the docs.
Note that while this is a new minor version release, the minimum supported Rust version for this crate remains at 1.28.0.
New features:
use_std feature has been deprecated in favor of the std feature. The use_std feature will be removed in regex 2. Until then, use_std will remain as an alias for the std feature.regex.This release does a bit of house cleaning. Namely:
regex crate, and is now part of the aho-corasick crate. See aho-corasick's new packed sub-module for details.utf8-ranges crate has been deprecated, with its functionality moving into the utf8 sub-module of regex-syntax.ucd-util dependency has been dropped, in favor of implementing what little we need inside of regex-syntax itself.In general, this is part of an ongoing (long term) effort to make optimizations in the regex engine easier to reason about. The current code is too convoluted and thus it is very easy to introduce new bugs. This simplification effort is the primary motivation behind re-working the aho-corasick crate to not only bundle algorithms like Teddy, but to also provide regex-like match semantics automatically.
Moving forward, the plan is to join up with the bstr and regex-automata crates, with the former providing more sophisticated substring search algorithms (thereby deleting existing code in regex) and the latter providing ahead-of-time compiled DFAs for cases where they are inexpensive to compute.
This release updates regex‘s minimum supported Rust version to 1.28, which was release almost 1 year ago. This release also updates regex’s Unicode data tables to 12.1.0.
This release contains a bug fix that caused regex's tests to fail, due to a dependency on an unreleased behavior in regex-syntax.
This release contains a few small internal refactorings. One of which fixes an instance of undefined behavior in a part of the SIMD code.
Bug fixes:
This release fixes up a few warnings as a result of recent deprecations.
This release fixes a regression introduced by a bug fix (for BUG #557) which could cause the regex engine to enter an infinite loop. This bug was originally reported against ripgrep.
This release fixes a bug in regex‘s dependency specification where it requires a newer version of regex-syntax, but this wasn’t communicated correctly in the Cargo.toml. This would have been caught by a minimal version check, but this check was disabled because the rand crate itself advertises incorrect dependency specifications.
Bug fixes:
This release fixes a backwards compatibility regression where Regex was no longer UnwindSafe. This was caused by the upgrade to aho-corasick 0.7, whose AhoCorasick type was itself not UnwindSafe. This has been fixed in aho-corasick 0.7.4, which we now require.
Bug fixes:
This releases fixes a few bugs and adds a performance improvement when a regex is a simple alternation of literals.
Performance improvements:
aho-corasick to 0.7 and uses it for foo|bar|...|quux regexes.Bug fixes:
((?x)).(?m){1,1}.This release fixes a bug found in the fix introduced in 1.1.1.
Bug fixes:
This is a small release with one fix for a bug caused by literal optimizations.
Bug fixes:
This is a small release with a couple small enhancements. This release also increases the minimal supported Rust version (MSRV) to 1.24.1 (from 1.20.0). In accordance with this crate's MSRV policy, this release bumps the minor version number.
Performance improvements:
New features:
Bug fixes:
This is a small release.
Performance improvements:
Bug fixes:
[[:blank:]] class that regressed in regex-syntax 0.5.This is a small release with an API enhancement.
New features:
Replacer trait.This is a small release that bumps the quickcheck dependency.
This is a small bug fix release.
Bug fixes:
This release exposes some new lower level APIs on Regex that permit amortizing allocation and controlling the location at which a search is performed in a more granular way. Most users of the regex crate will not need or want to use these APIs.
New features:
Bug fixes:
RegexBuilder::dot_matches_new_line.Parser::allow_invalid_utf8 in the regex-syntax crate.This release upgrades regex's Unicode tables to Unicode 11, and enables SIMD optimizations automatically on Rust stable (1.27 or newer).
New features:
size_hint on RegexSet match iterators.Bug fixes:
use_std feature isn't used.This release marks the 1.0 release of regex.
While this release includes some breaking changes, most users of older versions of the regex library should be able to migrate to 1.0 by simply bumping the version number. The important changes are as follows:
RegexBuilder.(?-u:\B) is no longer allowed in Unicode regexes since it can match at invalid UTF-8 code unit boundaries. (?-u:\b) is still allowed in Unicode regexes.From<regex_syntax::Error> impl has been removed. This formally removes the public dependency on regex-syntax.use_std, has been added and enabled by default. Disabling the feature will result in a compilation error. In the future, this may permit us to support no_std environments (w/ alloc) in a backwards compatible way.For more information and discussion, please see 1.0 release tracking issue.
This release primarily contains bug fixes. Some of them resolve bugs where the parser could panic.
New features:
Bug fixes:
[\d-a].\n character.(?flags).\pC was not recognized as an alias for \p{Other}.This release primarily updates the regex crate to changes made in std::arch on nightly Rust.
New features:
Hir type in regex-syntax now has a printer.This release introduces a new nightly only feature, unstable, which enables SIMD optimizations for certain types of regexes. No additional compile time options are necessary, and the regex crate will automatically choose the best CPU features at run time. As a result, the simd (nightly only) crate dependency has been dropped.
New features:
Bug fixes:
(?x)[ / - ] failed to parse.Bug gixes:
This release includes a ground-up rewrite of the regex-syntax crate, which has been in development for over a year.
New features:
&&, -- and ~~ binary operators within classes.\p{..} character classes. Things like \p{scx:Hira}, \p{age:3.2} or \p{Changes_When_Casefolded} now work. All property name and value aliases are supported, and properties are selected via loose matching. e.g., \p{Greek} is the same as \p{G r E e K}.UNICODE.md document has been added to this repository that exhaustively documents support for UTS#18.()+ is now a valid regex.Ast type in regex-syntax now contains span information.\u, \u{...}, \U and \U{...} syntax for specifying code points in a regular expression.Replace::by_ref adapter for use of a replacer without consuming it.Bug fixes:
Bug fixes:
Bug fixes:
New features:
Bug fixes:
simd has been bumped to 0.2.1, which fixes a Rust nightly build error.New features:
impl From<Match> for &str.Clone and PartialEq on Error.Bug fixes:
replace methods for empty matches.New features:
[\p{Greek}&&\pL] matches greek letters and [[0-9]&&[^4]] matches every decimal digit except 4. (Much thanks to @robinst, who contributed this awesome feature.)Bug fixes:
(?x) flag.Captures::get to API documentation.(?x) is used.rure_captures_len in the C binding.One major bug with replace_all has been fixed along with a couple of other touchups.
NoExpand to reference correct lifetime parameter.replace_all when replacing a match with the empty string.0.2.0 CHANGELOG entry. (RegexBuilder::compile was renamed to RegexBuilder::build.)regex should only require one version of memchr crate.This is a new major release of the regex crate, and is an implementation of the regex 1.0 RFC. We are releasing a 0.2 first, and if there are no major problems, we will release a 1.0 shortly. For 0.2, the minimum supported Rust version is 1.12.
There are a number of breaking changes in 0.2. They are split into two types. The first type correspond to breaking changes in regular expression syntax. The second type correspond to breaking changes in the API.
Breaking changes for regex syntax:
[:upper:] would parse as the upper POSIX character class. Now it parses as the character class containing the characters :upper:. The fix to this change is to use [[:upper:]] instead. Note that variants like [[:upper:][:blank:]] continue to work.[ must always be escaped inside a character class.&, - and ~ must be escaped if any one of them are repeated consecutively. For example, [&], [\&], [\&\&], [&-&] are all equivalent while [&&] is illegal. (The motivation for this and the prior change is to provide a backwards compatible path for adding character class set notation.)bytes::Regex now has Unicode mode enabled by default (like the main Regex type). This means regexes compiled with bytes::Regex::new that don't have the Unicode flag set should add (?-u) to recover the original behavior.Breaking changes for the regex API:
find and find_iter now return Match values instead of (usize, usize). Match values have start and end methods, which return the match offsets. Match values also have an as_str method, which returns the text of the match itself.Captures type now only provides a single iterator over all capturing matches, which should replace uses of iter and iter_pos. Uses of iter_named should use the capture_names method on Regex.at method on the Captures type has been renamed to get, and it now returns a Match. Similarly, the name method on Captures now returns a Match.replace methods now return Cow values. The Cow::Borrowed variant is returned when no replacements are made.Replacer trait has been completely overhauled. This should only impact clients that implement this trait explicitly. Standard uses of the replace methods should continue to work unchanged. If you implement the Replacer trait, please consult the new documentation.quote free function has been renamed to escape.Regex::with_size_limit method has been removed. It is replaced by RegexBuilder::size_limit.RegexBuilder type has switched from owned self method receivers to &mut self method receivers. Most uses will continue to work unchanged, but some code may require naming an intermediate variable to hold the builder.compile method on RegexBuilder has been renamed to build.is_match function has been removed. It is replaced by compiling a Regex and calling its is_match method.PartialEq and Eq impls on Regex have been dropped. If you relied on these impls, the fix is to define a wrapper type around Regex, impl Deref on it and provide the necessary impls.is_empty method on Captures has been removed. This always returns false, so its use is superfluous.Syntax variant of the Error type now contains a string instead of a regex_syntax::Error. If you were examining syntax errors more closely, you'll need to explicitly use the regex_syntax crate to re-parse the regex.InvalidSet variant of the Error type has been removed since it is no longer used.RegexSplits has been renamed to Split.A number of bugs have been fixed:
Replacer trait has been changed to permit the caller to control allocation.is_match function.0.1) and remove with_size_limit.Captures now have the correct lifetime parameters.PartialEq and Eq impls on Regex.is_empty from Captures since it always returns false.Captures.regex-syntax 0.3.4.regex-syntax dependency version for regex to 0.3.4.bytes::Regex::replace where extend was used instead of extend_from_slice.regex! compiler plugin macro.0.1.66 was yanked.)re$, it will be matched in reverse from the end of the haystack.unsafe in regex (to elide bounds checks).mempool crate (which used thread local storage) was replaced with a faster version of a similar API in @Amanieu's thread_local crate. It should reduce contention when using a regex from multiple threads simultaneously.bytes::Regex.Captures now has a Debug impl.