/(n.*?architectures?[::]s?8.*?)(?!n)/gi
// example
“`
const str = `processor : 0 BogoMIPS : 38.40 Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 CPU implementer : 0x51 CPU architecture: 8 CPU variant : 0x2 CPU part : 0x201 CPU revision : 1
processor : 1 BogoMIPS : 38.40 Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 CPU implementer : 0x51 CPU architecture: 8 CPU variant : 0x2 CPU part : 0x201 CPU revision : 1
processor : 2 BogoMIPS : 38.40 Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 CPU implementer : 0x51 CPU architecture: 8 CPU variant : 0x2 CPU part : 0x205 CPU revision : 1
processor : 3 BogoMIPS : 38.40 Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 CPU implementer : 0x51 CPU architecture: 8 CPU variant : 0x2 CPU part : 0x205 CPU revision : 1`
“`
// output
“`
[“↵processor : 1 BogoMIPS : 38.40 Features : fp asim… crc32 CPU implementer : 0x51 CPU architecture: 8”, “↵processor : 2 BogoMIPS : 38.40 Features : fp asim… crc32 CPU implementer : 0x51 CPU architecture: 8”, “↵processor : 3 BogoMIPS : 38.40 Features : fp asim… crc32 CPU implementer : 0x51 CPU architecture: 8”]
“`