def winningSym = /winline":([0-9]+)/
String line = """{"Id":1,"winline":5,"Winnings":50000, some random text, "winline":4, more random text, "winline":7, more stuff}"""
def res = (line =~ winningSym).collect { it[1] }
println(res)
ZGVmIHdpbm5pbmdTeW0gPSAvd2lubGluZSI6KFswLTldKykvClN0cmluZyBsaW5lID0gIiIieyJJZCI6MSwid2lubGluZSI6NSwiV2lubmluZ3MiOjUwMDAwLCBzb21lIHJhbmRvbSB0ZXh0LCAid2lubGluZSI6NCwgbW9yZSByYW5kb20gdGV4dCwgIndpbmxpbmUiOjcsIG1vcmUgc3R1ZmZ9IiIiCmRlZiByZXMgPSAobGluZSA9fiB3aW5uaW5nU3ltKS5jb2xsZWN0IHsgaXRbMV0gfQpwcmludGxuKHJlcyk=