,
foo,bar
,
,,foo,bar,,

foobar
 *(;) *
this  ; that;   and the other;   
grok
this  ; that;   and the other;   
\s+
this  ; that;   and the other;   
\s+
this  ; "that";   and the other;


\s*([+=-])\s*
sum  =  first +second- third
