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 FileMaker Pro Custom Functions

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  Average rating: 4.4  (30 votes)
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Caspar Harmer, Digital Fusion Ltd

Replace non alphanumeric characters with anything (or nothing)

Sample Input:

Sample Output:


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


Recursive function that filters out anything that is not alphanumeric
ie not from 0...9 and from a...Z.
It will replace the filtered text with nothing (filter it),
or replace the text with your desired string.

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


5 most recent comments | Show all 7 comments

you use it in a script or as the result of a calculated field.
Text is whatever text you want to process
ReplaceText is what you want to be put in place of text you are removing. Look at the example to see how this is used. i.e. any character that is replaced is replaced with the character or string that you specify.

Caspar Harmer, San Mateo, CA
January 28, 2013 2:31pm

Thank you, Caspar. Saved me at least an hour of head thrashing. :-)

genekeats, Los Angeles
February 28, 2013 5:42pm

Thanks very much
Exellent! I find very useful information here and it's slick

Thanks for these custom functions !

keep up the good work!

Carl-Gustaf, Sweden
September 01, 2015 9:14am


I'm feeling very stupid for not figuring out this custom function.
I have replaced the "ReplaceText with "" but now it's telling me that there are too many functions ))
What do i put in by the Function Parameters?

Roxanne Van den Berg, Cape Town, South Africa
January 12, 2016 10:34pm

Copy this into your custom function:

If( (Filter ( Left ( Text ; 1 ) ; "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklomnopqrstuvwxyz1234567890" ) =Left(Text;1) );
Left(Text;1) & If( Length(Text)>1; dfAlphaNumericFilter ( Right( Text ; (Length (Text) -1)); ReplaceText)) ;
ReplaceText & If( Length(Text)>1; dfAlphaNumericFilter ( Right( Text ; (Length (Text) -1)); ReplaceText))

Now, don't replace anything - assuming you called your function "dfAlphaNumericFilter". If you called it something else, you need to change the name above also (because it calls itself)

Then, feed in your parameters like this : dfAlphaNumericFilter("345---+++ab//321";"").

If you are having trouble, email me at rapsac at gmail dot com

Caspar Harmer, New Zealand
January 12, 2016 10:40pm

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