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a = "01,02,03,04,05,06|a1,a2,a3"
b = "03,05,07,09,10|a2,b1,b2,b3,b5"
a = a.split(/[,\|]/g)
b = b.split(/[,\|]/g)
var kv = {},arrSame=[]
for (var i = 0; i < a.length; i++) kv[a[i]] = true;
for (var i = 0; i < b.length; b++) if (kv[b[i]]) arrSame.push(b[i])
alert(arrSame.join()+'\n'+arrSame.length)