文字列に有効な電子メールが含まれているかテストします
CompatibleUnicode組み込みファンクション (PRIM_LIBI.ICompatibleUnicodeIntrinsics) のメンバ

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The isValidEmail method allows you test whether a string is a valid email address. This is based on the RFC5322 email standard.

• It cannot be more than 254 characters long
• It must not contain more than one @
• It must not begin with an @
• It must not begin with a period (.) and there must be at least one period in address
• It cannot have two periods next to each other
• It cannot contain a space
• It must have at least one character between the @ and period in the domain portion
• It must not end with a period

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