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 FileMaker Pro Custom Functions

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IsValidEmail ( theEmail )

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  Average rating: 3.5  (71 votes)
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Paul Turnbull, One of Me

Determines if a supplied email address is valid or not

Sample Input:
IsValidEmail ( "" )
Sample Output:

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


Takes a text string a checks to see if it is a valid email address. Includes a value list of over 260 Top Level Domains that are checked against. If the string is not a valid address it returns an explanation of the why the test failed.

Will not handle urls in the form "" although you could edit to handle this if you like.

Edited 11/13/05 - fixed bugs.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


Hello Paul,

Thank you for the function.

Little bug :

ééééé return true

text return true return true

Benka, Rennes, France
June 03, 2009 8:42am

text return true

Benka, Rennes, France
June 03, 2009 8:42am

Great function. However, he ampersand (&) is a valid character in an email address.

Jamie Thompson, Computech IT Services Ltd., Plymouth, UK
March 10, 2011 4:26am

Naming the function "IsValidEmail" in FileMaker 11 conflicts with an internal existing function name.

Maybe rename to "IsThisValidEmail"?
Anyway, thank you and I like this function very much.

Marc, San Diego, CA
March 11, 2011 11:04am

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