What are Recursive Lexer Rules in ANTLR4 good for?

Question

Just beginning with ANTLR4. Found that lexer rules can be recursive https://github.com/antlr/antlr4/blob/master/doc/lexer-rules.md#recursive-lexer-rules. What is the use case to use recursive lexer rules instead of recursive parser rules? Dont you loose all the information when using lexer recursive rules?

Answer 1

As mentioned in the comments by sepp2k: besides nested string literals, nested comments are 1 of the use cases:

COMMENT
 : '/*' ( COMMENT | . )*? '*/'
 ;