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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:
^ 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
\b at ASCII word boundary (\w on one side and \W, \A, or \z on the other)
\B not at ASCII word boundary
@ -127,5 +127,6 @@ ASCII character classes:
[[:word:]] word characters (== [0-9A-Za-z_])
[[:xdigit:]] hex digit (== [0-9A-Fa-f])
Unicode character classes are those in unicode.Categories and unicode.Scripts.
*/
package syntax