<i18n dev> RFR JDK-8013254: Constructor \w need update to add the support of \p{Join_Control}

Xueming Shen xueming.shen at oracle.com
Tue Apr 30 14:01:12 PDT 2013

My apology, the webrev is at



On 04/30/2013 10:01 AM, Xueming Shen wrote:
> Hi,
> It appears we dropped the ball on u+200c and u+200d when we updated
> the "simple word boundaries" back to jdk7 [1]. You can find most of the
> related discussion here [2]. These 2 code points are listed as one of the
> issues we were trying to fix but obviously the final doc and implementation
> don't address them. Mainly because the \p{Join_Control} was not explicitly
> listed in TR#18 "compatibility" section back then (the earlier version) [3],
> though these 2 code points are explicitly mentioned at section RL1.4 Simple
> Word Boundaries [4]. The \p{Join_Control} (u+200c and u+200d) has been
> added/listed in the "compatibility" section in the latest version of TR#18 [5].
> The proposed change here is to
> (1) add these two code points back to the collection of \w
> (2) list them explicitly into the \w definition as \p{Join_Control}
> (3) list Join_Control as one of the supported binary properties.
> http://mail.openjdk.java.net/pipermail/i18n-dev/2011-April/000381.html
> The webrev for RegExTest.java above includes the change for 8013252
> which is being reviewed as well, I'm not separating them out just for
> convenience. The regression/unit tests may not that "direct", here is
> a direct version to verify the fix.
>         Matcher wordU = Pattern.compile("\\w", Pattern.UNICODE_CHARACTER_CLASS).matcher("");
>         System.out.println(wordU.reset("\u200c").find());
>         System.out.println(wordU.reset("\u200d").find());
> thanks
> -Sherman
> [1] http://ccc.us.oracle.com/7039066
> [2] http://mail.openjdk.java.net/pipermail/i18n-dev/2011-April/000381.html
> [3] http://www.unicode.org/reports/tr18/tr18-13.html#Compatibility_Properties
> [4] http://www.unicode.org/reports/tr18/tr18-13.html#Simple_Word_Boundaries
> [5] http://www.unicode.org/reports/tr18/#Compatibility_Properties

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