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This PR contains the following updates:
1.8.4
->1.9.0
Release Notes
rust-lang/regex (regex)
v1.9.0
Compare Source
==================
This release marks the end of a years long rewrite of the regex crate
internals. 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:
Captures::extract
method for quickly accessing the substringsthat match each capture group in a regex.
R
, which enables CRLF mode. This makes.
match anyUnicode scalar value except for
\r
and\n
, and also makes(?m:^)
and(?m:$)
match after and before both\r
and\n
, respectively, but neverbetween a
\r
and\n
.RegexBuilder::line_terminator
was added to further customize the lineterminator used by
(?m:^)
and(?m:$)
to be any arbitrary byte.std
Cargo feature is now actually optional. That is, theregex
cratecan be used without the standard library.
regex 1.9
may make binary size and compile times even worse, anew experimental crate called
regex-lite
has been published. It prioritizesbinary size and compile times over functionality (like Unicode) and
performance. It shares no code with the
regex
crate.New features:
One can opt into CRLF mode via the
R
flag.e.g.,
(?mR:$)
matches just before\r\n
.Multi-pattern searches with offsets can be done with
regex-automata 0.3
.std
is now an optional feature.regex
may be used with onlyalloc
.RegexBuilder::line_terminator
configures how(?m:^)
and(?m:$)
behave.Anchored search APIs are now available in
regex-automata 0.3
.Add new
Captures::extract
method for easier capture group access.Add
regex-lite
crate with smaller binary sizes and faster compile times.Add
TryFrom
implementations for theRegex
type.Performance improvements:
Added a one-pass DFA engine for faster capture group matching.
Inner literals are now used to accelerate searches, e.g.,
\w+@​\w+
will scanfor
@
.PERF #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:
Fix matching bugs related to
\B
and inconsistencies across internal engines.Fix matching bug with capture groups.
Fix matching bug with word boundaries.
Fix bug where some regexes like
(re)+
were not equivalent to(re)(re)*
.Fix matching bug inconsistency between NFA and DFA engines.
Fix matching bug where literal extraction got confused by
$
.Add documentation to replacement routines about dealing with fallibility.
Use corpus rejection in fuzz testing.
Configuration
📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).
🚦 Automerge: Enabled.
♻ 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.
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