flex , how to lex a '>' character

[NicAx64]

I am using the lexer software independently without using the
yacc parser. what I want is to use this '>' character how should I
tell the lexer to do this ?

'\<' { InsertOperator ( ANGLE_OPEN) ; }
'\>' { InsertOperator ( ANGLE_CLOSE); }

I have already tried this but it gives an warning :

"input_to_lexer_generator.lex", line 186: warning, rule cannot be matched
"input_to_lexer_generator.lex", line 187: warning, rule cannot be matched
"input_to_lexer_generator.lex", line 191: warning, rule cannot be matched

how can I do this ?
--Thanks In Advance--