Python/tests/t011lexer.g

lexer grammar t011lexer;
options {
  language = Python;
}

IDENTIFIER:
        ('a'..'z'|'A'..'Z'|'_')
        ('a'..'z'
        |'A'..'Z'
        |'0'..'9'
        |'_'
            {
              print "Underscore"
              print "foo"
            }
        )*
    ;

WS: (' ' | '\n')+;