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regexp/syntax: add note about Unicode character classes

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As proposed on golang-nuts:
https://groups.google.com/g/golang-nuts/c/M3lmSUptExQ/m/hRySV9GsCAAJ

Includes the latest updates from re2's mksyntaxgo:
https://code.googlesource.com/re2/+/refs/heads/master/doc/mksyntaxgo

Change-Id: Ib7b79aa6531f473feabd0a7f1d263cd65c4388e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/264678
Reviewed-by: Russ Cox <rsc@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
This commit is contained in:
Tom Payne 2020-10-23 23:40:00 +01:00 committed by Emmanuel Odeke
parent 750b3729dc
commit 1d3baf20dc
1 changed files with 2 additions and 1 deletions
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3
src/regexp/syntax/doc.go
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@ -66,7 +66,7 @@ Grouping:
Empty strings: Empty strings:
^ at beginning of text or line (flag m=true) ^ at beginning of text or line (flag m=true)
$ at end of text (like \z not Perl's \Z) or line (flag m=true) $ at end of text (like \z not \Z) or line (flag m=true)
\A at beginning of text \A at beginning of text
\b at ASCII word boundary (\w on one side and \W, \A, or \z on the other) \b at ASCII word boundary (\w on one side and \W, \A, or \z on the other)
\B not at ASCII word boundary \B not at ASCII word boundary
@ -127,5 +127,6 @@ ASCII character classes:
[[:word:]] word characters (== [0-9A-Za-z_]) [[:word:]] word characters (== [0-9A-Za-z_])
[[:xdigit:]] hex digit (== [0-9A-Fa-f]) [[:xdigit:]] hex digit (== [0-9A-Fa-f])
Unicode character classes are those in unicode.Categories and unicode.Scripts.
*/ */
package syntax package syntax