[Bug classpath/22802] java.util.regex.Pattern doesn't handle parens in character sets consistently

[gcc-bugzilla at gcc dot gnu dot org]

Pattern.compile("[(]") works and matches a single open paren, but
Pattern.compile("([(])") doesn't, nor does Pattern.compile("(?:[(])").

I'm not sure whether parens in character sets need to be escaped, but either
way the current behavior is inconsistent.

A workaround is to extract the paren from the character set and use something
like (?:[abc]|() instead.

 % gcj --version
gcj (GCC) 4.0.0 20041125 (experimental)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22802