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FileMaker Pro Custom Functions

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IsValidEmail ( text )

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Average rating: 2.6 (24 votes)
Discuss this Custom Function

Michael Rhodes, Allied Data Service
http://allieddataservice.com

test if valid email for format and against current top level domains

Sample Input:

IsValidEmail ( "Rhodes.MichaelC@gmail.com" )

Sample Output:

/* This function is the same as IsValidEmailFormat, except that it also validates top-level domains against a list. Since top-level domains can be added by ICANN, I recommend the other function. Returns a True value if the parameter is a valid email address. Created by Michael Rhodes mike@allieddataservice.com Anybody may use this function so long as they keep my contact info in the comments of the function. */ IsEmpty ( text ) or Let ( [ alphanum = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" ; textEnds = Left ( text; 1 ) & Right ( text; 1 ) ; posDomain = Position ( text; "@"; 1; 1 ) ; domain = If ( posDomain; Right ( text; Length ( text ) - posDomain ) ) ; leftChar = Left ( domain; 1 ) ; posTLD = If ( posDomain; Position ( domain; "."; 1; 1 ) ) ; TLD = If ( posTLD; Right ( domain; Length ( domain ) - posTLD ) ) ] ; Filter ( text; alphanum & "_-@.'/+" ) = text // There are no invalid characters. and PatternCount ( text; "@" ) = 1 // There is only one @ symbol. and Filter ( textEnds; alphanum) = textEnds // First and last character are alphanumeric. and not Position ( text; ".."; 1; 1 ) and Middle ( text; posDomain - 1; 1 ) <> "." and Filter ( leftChar; alphanum ) = leftChar // Top level domain is valid. and not IsEmpty ( FilterValues ( TLD & ¶; "aero¶asia¶biz¶cat¶com¶coop¶edu¶gov¶info¶int¶jobs¶mil¶mobi¶museum¶name¶net¶org¶pro¶tel¶travel¶ac¶ad¶ae¶af¶ag¶ai¶al¶am¶an¶ao¶aq¶ar¶as¶at¶au¶aw¶ax¶az¶ba¶bb¶bd¶be¶bf¶bg¶bh¶bi¶bj¶bm¶bn¶bo¶br¶bs¶bt¶bv¶bw¶by¶bz¶ca¶cc¶cd¶cf¶cg¶ch¶ci¶ck¶cl¶cm¶cn¶co¶cr¶cu¶cv¶cx¶cy¶cz¶de¶dj¶dk¶dm¶do¶dz¶ec¶ee¶eg¶er¶es¶et¶eu¶fi¶fj¶fk¶fm¶fo¶fr¶ga¶gb¶gd¶ge¶gf¶gg¶gh¶gi¶gl¶gm¶gn¶gp¶gq¶gr¶gs¶gt¶gu¶gw¶gy¶hk¶hm¶hn¶hr¶ht¶hu¶id¶ie¶il¶im¶in¶io¶iq¶ir¶is¶it¶je¶jm¶jo¶jp¶ke¶kg¶kh¶ki¶km¶kn¶kp¶kr¶kw¶ky¶kz¶la¶lb¶lc¶li¶lk¶lr¶ls¶lt¶lu¶lv¶ly¶ma¶mc¶md¶me¶mg¶mh¶mk¶ml¶mm¶mn¶mo¶mp¶mq¶mr¶ms¶mt¶mu¶mv¶mw¶mx¶my¶mz¶na¶nc¶ne¶nf¶ng¶ni¶nl¶no¶np¶nr¶nu¶nz¶om¶pa¶pe¶pf¶pg¶ph¶pk¶pl¶pm¶pn¶pr¶ps¶pt¶pw¶py¶qa¶re¶ro¶rs¶ru¶rw¶sa¶sb¶sc¶sd¶se¶sg¶sh¶si¶sj¶sk¶sl¶sm¶sn¶so¶sr¶st¶su¶sv¶sy¶sz¶tc¶td¶tf¶tg¶th¶tj¶tk¶tl¶tm¶tn¶to¶tp¶tr¶tt¶tv¶tw¶tz¶ua¶ug¶uk¶us¶uy¶uz¶va¶vc¶ve¶vg¶vi¶vn¶vu¶wf¶ws¶ye¶yt¶yu¶za¶zm¶zw¶xn--0zwm56d¶xn--11b5bs3a9aj6g¶xn--80akhbyknj4f¶xn--9t4b11yi5a¶xn--deba0ad¶xn--g6w251d¶xn--hgbk6aj7f53bba¶xn--hlcj6aya9esc7a¶xn--jxalpdlp¶xn--kgbechtv¶xn--zckzah¶arpa¶" ) ) ) // end let
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

Description:

IsValidEmailFormat is a better choice in most situations, since top level domains are constantly created. However, for those who want to test both the format of the email and make sure the top level domain is legitimate according to the current list as of creation date, here is this alternative.

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

This is my Custom Function and I want to edit it

Discuss:

5 most recent comments | Show all 10 comments

Very useful function, but name.surname@dom.city.it return 0

i have modified your function with:
posDom = Position ( email; "@"; 1; 1 ) + 1 ;
user = Left ( email; posDom - 2 ) ;
nrDotUser = PatternCount ( user; "." );
nrDot = PatternCount ( email ; "." );
posTLD = Position ( email; "."; posDom + 1; nrDot - nrDotUser ) ;
dom = Middle ( email; posDom; posTLD - posDom ) ;
tld = Right ( email; Length ( email ) - posTLD )

now it's work ;-)

Paolo Casagrande, Trento - Italy
April 22, 2010 3:17am

Thanks to Paolo and to Brian Dunning!

Chris D'Angelo, New York, NY
October 28, 2010 3:13pm

I really don't like this function because the top level domains can change. Please use my similar custom function IsValidEmailFormat.

Michael Rhodes, Rancho Cucamonga
December 05, 2010 8:19am

Try the update I just posted.

Michael Rhodes, Rancho Cucamonga
December 05, 2010 8:30am

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

http://www.BusinessManCRM.com

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

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

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