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Their possible affinity test: "^ (= ^ {3,255} $?.) [A-zA-Z0-9] [- a-zA-Z0-9] {0,62} (\\ [a-zA-. Z0-9] [- a-zA-Z0-9] {0,62}) + $ "js verify domain, minimum number of bits is 3, the English support case-insensitive, point () bar (-) to rest do not support, online error too many own modified verified, and use it every time we need to verify yourself to see whether you need! ! ! ! ! ! 1