Software Venture Consulting

FileMaker Pro downloads & Resources
FileMaker Custom Functions
FileMaker Web Viewer Examples
FileMaker Pro & Lasso Consulting
FileMaker Books
FileMaker Articles
FileMaker Error Reference

Free Web Tools
Free FileMaker Tools

Personal Pages

Shopping Cart
Shopping Cart


Free Newsletter


Privacy Policy

FileMaker is a registered trademark of FileMaker, Inc. in the U.S. and other countries.


 FileMaker Pro Custom Functions

List  |  Show Random  |  Upload  |  Add This to Your Site

ExtractPortion ( textField ; prePortion ; postPortion )

Rate this function:  

  Average rating: 4.0  (38 votes)
  Discuss this Custom Function

Doug Elam, US Home Systems, Inc.

Extract a portion of a text field

Sample Input:
ExtractPortion ( "" ; "www." ; ".com" )
Sample Output:

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


The "middle" function is nice, but it requires you to know how many characters you want to extract. Sometimes, you don't know this, so you have to make complicated calculations to extract data. This is a simple function to extract data between point A and point B.

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


Note that this extracts the contents between the first occurrences of prePortion & postPortion in the text.

Daniel Wood, New Zealand
September 22, 2010 2:39pm

This function actually fails in instances where the first occurrence of the postPortion is before the first occurrence of the prePortion.

<div class='test'>some content</div>
<div class='test2'>some content</div>

If I run:
ExtractPortion ( thatfield ; "<div class='test2'>" ; "</div>" )

it will fail due to the first "</div>" occurrence.

You can correct this in changing:
end = Position ( text ; postPortion ; 1 ; 1 ) - 1 ;

to this:
end = Position ( text ; postPortion ; start ; 1 ) - 1 ;

Mike Beargie, Columbus, Oh
September 30, 2017 1:24pm

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

Your Name:
characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
Answer 2 + 4 =
Search for Custom Functions:

Custom Functions Widget
Download the Custom Function Dashboard Widget for OS X
Keep all the latest Custom Functions right at your fingertips!

Newest Custom Functions:

1. HexUUIDToNum_cf (_uuid)
  (Sat, Jun 16, 1:55pm)
2. httpResponseCode ( responseHeaders )
  (Tue, Jun 12, 10:40pm)
3. FindDuplicateCharacters ( string )
  (Fri, Jun 08, 5:01pm)
4. FieldRepetitionLast ( field ; maxRepetition )
  (Wed, Jun 06, 6:05pm)
5. CountModifiedRecords ( NameTimestampField ; StartTimestamp ; EndTimestamp )
  (Mon, May 28, 8:23am)
6. JSONArrayLength ( JSONArrayStr )
  (Fri, May 25, 7:46am)
7. interpolation (y1; y2; y3; x1; x2; x3; x1y1; x2y1; x1y2; x2y2; rnd)
  (Sat, May 19, 3:55am)
8. @JSONFormatElements ( json )
  (Tue, May 15, 3:31am)

RSS Feed of Custom Functions