c# - Question about ,(?=(?:[^']*'[^']*')*[^']*$) -

c# regex split - commas outside quotes

var result = regex.split(samplestring, ",(?=(?:[^\"]*\"[^\"]*')*[^\"]*$)"); 

i have problems understand how works.

specifically, don't know * matches here?

",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)")                      ^ 

does mean

there 0 or more of (?=(?:[^\"]*\"[^\"]*')

update sample input

2,1016,7/31/2008 14:22,geoff dalgas,6/5/2011 22:21,http://stackoverflow.com,"corvallis, or",7679,351,81,b437f461b3fd27387c5d8ab47a293d35,34 

use following code test:

string samplestring = "2,1016,7/31/2008 14:22,geoff dalgas,6/5/2011 22:21,http://stackoverflow.com,\"corvallis, or\",7679,351,81,b437f461b3fd27387c5d8ab47a293d35,34"; 

it means group (?:[^']*'[^']*') matched 0 or more times.

,       // match 1 comma (?=     // start positive lookahead assertion (?:     // start non-capturing group [^']*   // match single-quote 0 or more times '       // match 1 single-quote [^']*   // match single-quote 0 or more times '       // match 1 single-quote )*      // end group , match 0 or more times [^']*   // match single-quote 0 or more times $)      // end lookahead