unicode « word « Java Regex Q&A

1. Should I be able to quote a leading or trailing dollar sign ($) inside a word boundary in Java Regular Expression?    stackoverflow.com

I'm having trouble getting regular expressions with leading / trailing $'s to match in Java (1.6.20). From this code:

System.out.println( "$40".matches("\\b\\Q$40\\E\\b") );
System.out.println( "$40".matches(".*\\Q$40\\E.*") );
System.out.println( "$40".matches("\\Q$40\\E") );
System.out.println( " ------ " );
System.out.println( "40$".matches("\\b\\Q40$\\E\\b") );
System.out.println( "40$".matches(".*\\Q40$\\E.*") ...

2. Detecting words that start with an accented uppercase using regular expressions    stackoverflow.com

I want to extract the words that begin with a capital — including accented capitals — using regular expressions in Java. This is my conditional for words beginning with capital A through ...

3. regular expression containing unicode words    stackoverflow.com

I'd like to match all strings containing a certain word. like:

String regex = (?:\P{L}|\W|^)(???)(?:\b|$)

java.util.regex.PatternSyntaxException: Unmatched closing ')' near index 39
(?:\P{L}|\W|^)((?:??|??|??)(?:?)|?)|?)?)(?:\b|$)

4. Unicode word boundaries in Regex    forums.oracle.com

Dear All, I am using the following simple regex: " w+" which matches one more word characters. My problem is that it is not matching unicode characters which are part of my language. Is there any way to force java regex engine to include unicode characters in w ? If this is not possible is there any third party library tha ...