RFR JDK-8013254: Constructor \w need update to add the support of \p{Join_Control} (original) (raw)

Xueming Shen xueming.shen at oracle.com
Tue Apr 30 17:01:44 UTC 2013

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

More information about the core-libs-dev mailing list