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FileMaker Pro Custom Functions

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IsValidEmail ( text )

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Average rating: 2.5 (13 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, sub for hire rhodes.michaelc@gmail.com Anybody may use this function so long as they keep my contact info in the comments of the function. */ Filter ( text; "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890_-@." ) = text // There are no invalid characters. and If ( PatternCount ( text; "@" ) = 1 // There is only one @ symbol. and IsEmpty ( Filter ( Left ( text; 1 ) & Right ( text; 1 ); "@" ) ) // @ symbol is not first or last character. and not ( // No illegal symbol combinations. + PatternCount ( text; "__" ) + PatternCount ( text; "_." ) + PatternCount ( text; "._" ) + PatternCount ( text; ".." ) + PatternCount ( text; ".-" ) + PatternCount ( text; "-." ) ) ; Let ( [ posDom = Position ( text; "@"; 1; 1 ) + 1 ; posTLD = Position ( text; "."; posDom + 1; 1 ) ; user = Left ( text; posDom - 2 ) ; dom = Middle ( text; posDom; posTLD - posDom ) ; tld = Right ( text; Length ( text ) - posTLD ) ] ; If ( // There is a dot after the @ symbol, but not immediately after. posTLD > 1 ; // The first and last characters are alphanumeric. IsEmpty ( Filter ( Left ( user; 1 ) & Right ( user; 1 ) & Left ( dom; 1 ) & Right ( dom; 1 ) & Left ( tld; 1 ) & Right ( tld; 1 ); "_-." ) ) // No underscore in domain. and IsEmpty ( Filter ( dom & tld; "_" ) ) // 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 inner if ) // end let ) // end outer if
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 6 comments

Carl,

Thanks for the positive feedback..

Michael Rhodes, Rancho Cucamonga
April 13, 2009 9:59am

myname@yrdsb.edu.on.ca returns 0
myname@logisoft.qc.ca returns 0

It would be a great addition to support domains made of multiple extensions.

Philippe Lazzaroni, Montreal, Qc
October 01, 2009 5:30am

Love the function, however if I type an e-mail address into the field being validated by your function and then decide I do not want an address there and attempt to delete it, the validation fails trying to evaluate the empty string. Just needs an isempty test. Thanks!

Michael McCoy, Columbus, OH
November 02, 2009 6:24am

Yes, it would be a great addition to support domains made of multiple extensions.

Mike Kowalski, Monster Town, MI
November 16, 2009 4:30am

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

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

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