The function ISEMAIL outputs TRUE if given a validly-formatted email address and FALSE otherwise.
This function takes a single string as input. It then checks to see if the given string is a validly-formatted email address and outputs TRUE if it is, FALSE if it isn't.
ISEMAIL(string) -> result
- string (required, type: string | email)
- The string that may or may not be a validly-formatted email address.
- result (type: boolean)
- The result of checking if the given string is a validly formatted-email; TRUE means that it is and FALSE means that it isn't.
ISEMAIL("email@example.com") -> TRUE
ISEMAIL("support@airkit") -> FALSE
The following example takes the string "supportairkit.com" and checks to see if it is a validly-formatted email address. This string is nearly identical to the string given as input in the first, but it lacks the "@" symbol between the user name and the domain. This "@" symbol is required in order for an email to be validly formatted, and thus "supportairkit.com" is not a valid email:
ISEMAIL("supportairkit.com") -> FALSE
The ISEMAIL function checks to see if the given input is a validly-formatted email address, but this is different from confirming that the email address actually exists. The following example takes the string "firstname.lastname@example.org" and checks to see if it is a validly-formatted email address. "email@example.com" is, in fact, a validly-formatted email address: it has a username, an "@" symbol, and a domain complete with the top-level domain ".com". The fact that "firstname.lastname@example.org" is a made-up email address at – at the time of writing this document – a non-existent domain does nothing to change the fact it is formatted like a proper email address:
ISEMAIL("email@example.com") -> TRUE
ISEMAIL("fake@not_a_website.com") -> FALSE
However, while the characters in the domain need to be of the correct type in order for ISMAIL to recognize the given input as a validly-formatted email address, they don't need to be meaningful. Indiscriminate keyboard mashing is a valid domain and even top-level domain, as long as the only characters entered within them are letters, numbers, and hyphens. The content of the username is even less discerning: most symbols, including underscores and exclamation marks, are allowed in a validly-formatted email address:
ISEMAIL("firstname.lastname@example.org") -> TRUE