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This reverts commit 40b9f5ded50ac4ce8c9323921ec556ad611af6b7.
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- unicode tests live in coretest crate
- libcollections str tests need UnicodeChar trait.
- libregex perlw tests were checking a char in the Alphabetic category,
\x2161. Confirmed perl 5.18 considers this a \w character. Changed to
\x2961, which is not \w as the test expects.
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An empty regex is a valid regex that always matches. This behavior
is consistent with at least Go and Python.
A couple regression tests are included.
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[breaking-change]
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Also adds a regex_macros crate, which provides natively compiled
regular expressions with a syntax extension.
Closes #3591.
RFC: 0007-regexps
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