[type]
Lexer

[grammar]
lexer grammar L;
I : .*? ('a' | 'ab') {<Text():writeln()>} ;
WS : (' '|'\n') -> skip ;
J : . {<Text():writeln()>};

[input]
ab

[output]
a
b
[@0,0:0='a',<1>,1:0]
[@1,1:1='b',<3>,1:1]
[@2,2:1='<EOF>',<-1>,1:2]