public class RegexTest {
    public static void main( String args[] ) {
        String sentence = "This is a test of regular expressions.";
        System.out.println( sentence.matches( "\w" ) ? "Matches" : "Doesn't match" );
    }
}

my $sentence = 'This is a test of regular expressions.';
print ( $sentence =~ /w/ ? "Matches" : "Doesn't match" ) . "n";