This is a patch release that fixes a bug where (?-u:\B) was allowed in
Unicode regexes, despite the fact that the current matching engines can report
match offsets between the code units of a single UTF-8 encoded codepoint. That
in turn means that match offsets that split a codepoint could be reported,
which in turn results in panicking when one uses them to slice a &str.
This bug occurred in the transition to regex 1.8 because the underlying
syntactical error that prevented this regex from compiling was intentionally
removed. That's because (?-u:\B) will be permitted in Unicode regexes in
regex 1.9, but the matching engines will guarantee to never report match
offsets that split a codepoint. When the underlying syntactical error was
removed, no code was added to ensure that (?-u:\B) didn't compile in the
regex 1.8 transition release. This release, regex 1.8.4, adds that code
such that Regex::new(r"(?-u:\B)") returns to the regex <1.8 behavior of
not compiling. (A bytes::Regex can still of course compile it.)
Bug fixes:
[BUG #1006](rust-lang/regex#1006):
Fix a bug where (?-u:\B) was allowed in Unicode regexes, and in turn could
lead to match offsets that split a codepoint in &str.
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Bumps regex from 1.8.3 to 1.8.4.
Changelog
Sourced from regex's changelog.
Commits
5a34a391.8.4407f6d3changelog: 1.8.4b2ca9c1compile: make Regex::new(r"(?-u:\B)") fail againDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase.Dependabot commands and options
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