Is it good choice to use JFlex/flex to write a lexer for YAML?

Question

I'm trying to use JFlex to write a lexer for YAML, but found it hard, since:

1. Indentation is sensitive in YAML

2. There are multiline string like:

   longstr: >
     This is 
     multiline
     line
   

   is hard to implement.

I don't know how to determine and return correct token type for them.

I wander is it good choice to use JFlex? Or do I need some other tool for YAML?