Java REGEX code to validate Indian language characters not working?

Why the following code not working(resulting false) with Indian languages?

System.out.println(Charset.forName("UTF-8").encode("అనువాద")
                .asCharBuffer().toString().matches("\\p{L}+"));

System.out.println(Charset.forName("UTF-8").encode("स्वागत")
                .asCharBuffer().toString().matches("\\p{L}+"));

System.out.println(Charset.forName("UTF-8").encode("நல்வரவு")
                .asCharBuffer().toString().matches("\\p{L}+"));

All the above code returns false. What is the problem with this regex? How to validate any unicode character in the world?