TrimFrom ( text ; delimiter ; occurrence )

returns all text following the specified occurrence of the specified delimiter

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Jeff Drake - Show more from this author
Drakeling Technologies

Sample input:

TrimFrom ( "Mississippi" ; "i" ; 3 )

Sample output:

ppi

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/*
=======================================================
    TrimFrom ©2005-2015 Drakeling Technologies
    Creation: 2005 by Jeff Drake
    Modification: 2009 by Jeff Drake
    Modification: 25 November 2014 by Jeff Drake
    Modification: 12 May 2015 by Jeff Drake

    Purpose: Trim the specified text from the specified charcters.

    Examples:
    • TrimFrom ( "Mississippi" ; "i" ; 3 ) = "ppi"
    • TrimFrom ( "Mississippi" ; "s" ; 1 ) = "sissippi"
    • TrimFrom ( "Mississippi" ; "p" ; -2 ) = "p"

    Dependencies: none
=======================================================
*/


Let ( [
         #tLength = Length ( text ) ;
         #tStart = If ( occurrence > 0 ; 1 ; #tLength ) ;
         #dPosition = Position ( text ; delimiter ; #tStart ; occurrence ) ;
         #dLength = Length ( delimiter ) ;
         #dCount = PatternCount ( text ; delimiter ) 

] ; //end define Let

   Case (

      //If the delimiter doesn’t exist in the string, return nothing.
      #dCount = 0 ; $null ;

      //If the delimiter doesn’t exist often enough in the string, return nothing.
      Abs ( #dCount ) < Abs ( occurrence ) ; $null ;


      //Otherwise, trim the value from the [occurrence]th delimiter.
         Right ( text ; #tLength - #dPosition - #dLength + 1 )

   ) //end Case

) //end Let

This function acts like Right, but uses the Position of the specified delimiter as a point of reference. If the occurrence parameter is:

• a positive integer, the value returned will be all characters following that occurrence of the delimiter, moving forwards from the first character of the original text.

• a negative integer, the value returned will be all characters following that occurrence of the delimiter, moving backwards from the last character of the original text.

• zero or non-numeric, the original text is returned in its entirety.

Comments

		Brian Dunning, BrianDunning.com Aug 20, 2018
Reading your description, it sounds to me like the output in your example should be iss.

		Brian Dunning, BrianDunning.com Aug 20, 2018
Oh no, I get it now. Never mind.

		Jeff Drake, Drakeling Technologies Aug 20, 2018
Perhaps I didnâ€™t word it well. Iâ€™m certainly open to suggestions, if you have any What Iâ€™m trying to get across is that, in the example, the function will return everything following the third "i" in "Mississippi".

		Jeff Drake, Drakeling Technologies Aug 20, 2018
No problem. I updated the description so itâ€™s hopefully more understandable.

		Razor Jan 21, 2019
Did exactly what I expected it to do. Nice!

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

TrimFrom ( text ; delimiter ; occurrence )

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