filterLines ( filterField ; filterValue ; Result )
Examines a list of values, removing lines that do not contain a given filter value.
Average rating: 4.6 (29 votes) Log in to vote
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Rob Atkinson Webwyz Systems http://www.webwyzsystems.com |
"Joe Smith BC 95
Fred Jones AB 96
Gail Peters NB 98
Herb Gardner SK 95";
"95";
"")
Herb Gardner SK 95
Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
Many solutions have a field where a log is written line by line - for revisions, modifications, etc. Usually a carriage return is used to separate each line.
As the system ages, records can end up with a single field containing hundreds of log entries - detailing a wide variety of information.
Use filterLines to recursively search a text field, line by line for a given value. Only lines containing that value is returned.
Each line must be separated by a carriage return(ΒΆ).
Comments
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Bruce Robertson Jan 14, 2012 |
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| Can also be written as: /* filterLines( filterField; filterValue ) */ Case( IsEmpty( filterField );"" ; Let ([ numValues = ValueCount( filterField ); topValue=LeftValues ( filterField; 1 ); match=Case(PatternCount(topValue; filterValue); topValue); remainValues=RightValues( filterField; numValues-1)]; match & filterLines( remainValues; filterValue) ) ) |
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Rob Atkinson, Vancouver Jan 15, 2012 |
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| Thanks Bruce! Much neater and more concise. | ||
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Derek Bastille, University of Alaska Fairbanks Jan 17, 2012 |
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| If you have a really long log, you might run into the recursion limits doing this (10,000). Thus, it might be better to take a page from the Unix grep utility and do this line by line. That is, use a script to: -- put the lines in a variable - iterate through the lines - for each line, if a match copy the line to an output variable - return the output variable |
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Rob Atkinson, Vancouver, B.C. Jan 18, 2012 |
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| You are right Derek - I should have pointed this out. The function isn't suitable as a "real" log parser. I originally proposed something similar to your solution to my client. The client didn't like that because it wasn't dynamic. Every record you had to run the script..every time you looked at the log. The client was saving the username, along with what was modified in a field. They had thousands of records containing 0 to 500 revisions. They just wanted to be able to enter a username and see what they had changed. However, you point out an important limitation. |
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Rudi Apr 15, 2022 |
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| Is there a way to only filter the lines that start with a given value ? KR Rudi |
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