My own preference is for is... naming; it makes it clear that it's a boolean. I'd say isEmailValid or isEmail -- but with different contects. isEmail to me implies you are checking whether it's an email at all, but isEmailValid is checking if it is a valid email. A valid email is certainly an email.
Honestly, I'd probably have both, for different purposes. They read as completely distinct.
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My own preference is for
is...naming; it makes it clear that it's a boolean. I'd sayisEmailValidorisEmail-- but with different contects.isEmailto me implies you are checking whether it's an email at all, butisEmailValidis checking if it is a valid email. A valid email is certainly an email.Honestly, I'd probably have both, for different purposes. They read as completely distinct.