[commit-cp] [bug #11962] java.util.regex.Matcher.group(int) differs from Sun's API

[Joe Gallo]

Follow-up Comment #1, bug #11962 (project classpath):

java.util.regex.Matcher returns IllegalStateException for itself, see
assertMatchOp at the end of Matcher.java; so gnu.regexp.REMatch doesn't have
to throw it.

/gnu/regexp/REMatch.java, however, does incorrectly return empty strings
instead of null values for groups that are outside the range of the regex's
result.

Attached is a simple patch that corrects the issue in REMatch.java.
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Additional Item Attachment:

File name: regexp_should_return_null.patch Size:0 KB
Changes return \"\" to return null.
<http://savannah.gnu.org/bugs/download.php?item_id=11962&item_file_id=2492>

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