I have the following string:
55,1001wuensche.com,0,354137264,1,\"0.00 %\",0,\"0.00 %\",\"2016-04-24 09:00:24\" 56,100hoch3.de,47,2757361,2,\"0.00 %\",0,\"0.0
^.*?,(.*?),.*$
The capture group $1 will be everything between the first two commas.
$1