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7,11,1:2,"AAA,BBB,CCC",DDD
7,11,1:2,"AAA@BBB@CCC",DDD
str = '7,11,1:2,"AAA,BBB,CCC,sfd",DDD'
str = str.replace(/"\w+(\,\w+)+"/g, function(v){return v.replace(/,/g, "@");});
var origin = '7,11,1:2,"AAA,BBB,CCC",DDD';
var after = origin.replace(/(\"\w+),(\w+),(\w+\")/, '$1@$2@$3');