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 FileMaker Pro Custom Functions

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EliminatePrefix ( value; prefix )

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  Average rating: 4.2  (40 votes)
  Discuss this Custom Function

Martin Brunner, Zurich Financial Services

Recursively eliminate any prefixes

Sample Input:
EliminiatePrefix (00000254058 ; 0 )
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


This function can be used, if it is not clear, how many times a certain prefix exists in front of a certain value. The function recursively eliminates the specified prefix.

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 10 comments


That's a simple one:

Middle ( Pn_Yoke ; 2 ; 999)

Like this you start at the second character and take whatever comes behind. Hope that helps....

Martin, Zürich
June 27, 2014 12:34am

Thanks a lot Martin Z.

Now I need validate the prefix P on the field, but I don't know how can get it,
By example the Data entry on the field is P764-15543-001 , I need validate the first character "P" prefix if the condition are met the ned step is use middle(Pn_Yoke ; 2 ; 999)
If the condition are not met we need delete the data entry on the field.

One more time thanks four you help on this matter..

Antonio Loera, Mexico
June 27, 2014 1:30pm


Again simple:

If ( Left ( Pn_Yoke ; 1 ) = "P" ; Middle(Pn_Yoke ; 2 ; 999) ; Pn_Yoke )


Martin, Zürich
June 30, 2014 12:29am

Thanks a lot Martin

I really apreciated you time and Support on this matter.

Sorry by my questions as beginner programming on file maker.

Now I need a condition when the prefix is different of "P" delete the information entry on the field, keept the mouse cursor on the same field until the prefix is equal to "P" and also send a message error like "Invalid Prefix".


Antonio loera, Matehuala, Mexico
July 02, 2014 5:53pm


In that case you're looking at a script, rather than just a Custom Function.

Create a script with the name: "Validate Pn_Yoke Field"
Enter the following in the script:

If [(not IsEmpty(db_Name::Pn_Yoke)) and (Upper(Left(db_Name::Pn_Yoke ; 1)) <> "P")]
Set Field [db_Name::Pn_Yoke ; ""]
Show Custom Dialog ["ERROR" ; "Invalid Prefix"]
Go to Field [db_Name::Pn_Yoke]
End If

Now go to the Pn_Yoke field on the layout and set up a script trigger for OnObjectExit. The trigger points to the Validate Pn_Yoke Field script.

That should do the trick. Good luck.


Leon, Albir Playa, Spain
July 17, 2014 5:47am

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