antlr4 - Antlr Lexer exclude a certain pattern -

in antlr lexer, how can achieve parsing token this:

a word contains non-space letter not '.{' inside it. best can come using semantics predicate.

word: wl+   {!gettext().contains(".{")}; wl: ~[ \n\r\t]; 

i'm bit worried use semantics predicate though cause word here lexed millions of times think put semantics predicate hit performance.

this coming requirement need parse like:

token_one.{token_two} 

while token_one can include . , { in letter.

i'm using antlr 4.

you need limit predicate evaluation case following . in input.

word   : ( ~[. \t\r\n]     | '.' {_input.la(1)!='{'}?     )+   ;