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This PR contains the following updates:
2.0
->2.1
1.9
->1.10
Release Notes
clap-rs/clap-verbosity-flag (clap-verbosity-flag)
v2.1.0
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Compatibility
Features
Default
v2.0.1
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Features
log
rust-lang/regex (regex)
v1.10.2
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===================
This is a new patch release that fixes a search regression where incorrect
matches could be reported.
Bug fixes:
Revert broadening of reverse suffix literal optimization introduced in 1.10.1.
v1.10.1
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===================
This is a new patch release with a minor increase in the number of valid
patterns and a broadening of some literal optimizations.
New features:
Loosen ASCII-compatible rules such that regexes like
(?-u:☃)
are now allowed.Performance improvements:
Broader the reverse suffix optimization to apply in more cases.
v1.10.0
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===================
This is a new minor release of
regex
that adds support for start and endword boundary assertions. That is,
\<
and\>
. The minimum supported Rustversion has also been raised to 1.65, which was released about one year ago.
The new word boundary assertions are:
\<
or\b{start}
: a Unicode start-of-word boundary (\W|\A
on the left,\w
on the right).\>
or\b{end}
: a Unicode end-of-word boundary (\w
on the left,\W|\z
on the right)).
\b{start-half}
: half of a Unicode start-of-word boundary (\W|\A
on theleft).
\b{end-half}
: half of a Unicode end-of-word boundary (\W|\z
on theright).
The
\<
and\>
are GNU extensions to POSIX regexes. They have been addedto the
regex
crate because they enjoy somewhat broad support in other regexengines as well (for example, vim). The
\b{start}
and\b{end}
assertionsare aliases for
\<
and\>
, respectively.The
\b{start-half}
and\b{end-half}
assertions are not found in anyother regex engine (although regex engines with general look-around support
can certainly express them). They were added principally to support the
implementation of word matching in grep programs, where one generally wants to
be a bit more flexible in what is considered a word boundary.
New features:
Add support for
\<
and\>
word boundary assertions.DFAs now have a
start_state
method that doesn't use anInput
.Performance improvements:
Unicode character class operations have been optimized in
regex-syntax
.Make patterns containing lots of literal characters use less memory.
Bug fixes:
Fix a bug that could result in incorrect match spans when using a Unicode word
boundary and searching non-ASCII strings.
Fix panics that can occur in
Ast->Hir
translation (not reachable fromregex
crate).
Remove guarantees in the API that connect the
u
flag with a specific HIRrepresentation.
regex-automata
breaking change release:This release includes a
regex-automata 0.4.0
breaking change release, whichwas necessary in order to support the new word boundary assertions. For
example, the
Look
enum has new variants and theLookSet
type now usesu32
instead of
u16
to represent a bitset of look-around assertions. These areoverall very minor changes, and most users of
regex-automata
should be ableto move to
0.4
from0.3
without any changes at all.regex-syntax
breaking change release:This release also includes a
regex-syntax 0.8.0
breaking change release,which, like
regex-automata
, was necessary in order to support the new wordboundary assertions. This release also includes some changes to the
Ast
type to reduce heap usage in some cases. If you are using the
Ast
typedirectly, your code may require some minor modifications. Otherwise, users of
regex-syntax 0.7
should be able to migrate to0.8
without any code changes.regex-lite
release:The
regex-lite 0.1.1
release contains support for the new word boundaryassertions. There are no breaking changes.
v1.9.6
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==================
This is a patch release that fixes a panic that can occur when the default
regex size limit is increased to a large number.
Fix a bug where computing the maximum haystack length for the bounded
backtracker could result underflow and thus provoke a panic later in a search
due to a broken invariant.
v1.9.5
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==================
This is a patch release that hopefully mostly fixes a performance bug that
occurs when sharing a regex across multiple threads.
Issue #934
explains this in more detail. It is also noted in the crate
documentation.
The bug can appear when sharing a regex across multiple threads simultaneously,
as might be the case when using a regex from a
OnceLock
,lazy_static
orsimilar primitive. Usually high contention only results when using many threads
to execute searches on small haystacks.
One can avoid the contention problem entirely through one of two methods.
The first is to use lower level APIs from
regex-automata
that require passingstate explicitly, such as
meta::Regex::search_with
.The second is to clone a regex and send it to other threads explicitly. This
will not use any additional memory usage compared to sharing the regex. The
only downside of this approach is that it may be less convenient, for example,
it won't work with things like
OnceLock
orlazy_static
oronce_cell
.With that said, as of this release, the contention performance problems have
been greatly reduced. This was achieved by changing the free-list so that it
was sharded across threads, and that ensuring each sharded mutex occupies a
single cache line to mitigate false sharing. So while contention may still
impact performance in some cases, it should be a lot better now.
Because of the changes to how the free-list works, please report any issues you
find with this release. That not only includes search time regressions but also
significant regressions in memory usage. Reporting improvements is also welcome
as well! If possible, provide a reproduction.
Bug fixes:
Fix a performance bug where high contention on a single regex led to massive
slow downs.
v1.9.4
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==================
This is a patch release that fixes a bug where
RegexSet::is_match(..)
couldincorrectly return false (even when
RegexSet::matches(..).matched_any()
returns true).
Bug fixes:
Fix a bug where a prefilter was incorrectly configured for a
RegexSet
.v1.9.3
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==================
This is a patch release that fixes a bug where some searches could result in
incorrect match offsets being reported. It is difficult to characterize the
types of regexes susceptible to this bug. They generally involve patterns
that contain no prefix or suffix literals, but have an inner literal along with
a regex prefix that can conditionally match.
Bug fixes:
Fix a bug with the reverse inner literal optimization reporting incorrect match
offsets.
v1.9.2
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==================
This is a patch release that fixes another memory usage regression. This
particular regression occurred only when using a
RegexSet
. In some cases,much more heap memory (by one or two orders of magnitude) was allocated than in
versions prior to 1.9.0.
Bug fixes:
Fix a memory usage regression when using a
RegexSet
.v1.9.1
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==================
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:
Change the allocation strategy for the backtracker to be less aggressive.
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