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ListIndex ( list ; string ; matchcase )

Seaches a list and returns the indexnumber if found

  Average rating: 4.5 (33 votes) Log in to vote

Theo Ros - Show more from this author

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

/*------------------------------------------------------- Searches a Return delimited list 'list' for the occurrance of the given value. Returns the 1-based indexnumber if found, 0 if value is not in the list. Syntax: ListIndex ( list ; string ; matchcase ) In: list - the return delimited list to search string - the string to look for in the item matchcase - if True, the list is searched Case Sensitive if False, a Case Insensitive search is performed Return type: Number ListIndex ( "John¶Paul¶George¶Ringo" ; "ringo" ; False ) --> 4 ListIndex ( "John¶Paul¶George¶Ringo" ; "ringo" ; True ) --> 0 Theo Ros ----------------------------------------------------------*/ Let ( [ lst = If ( Left ( list ; 1 ) <> "¶" ; "¶" & list ; list ) & "¶" ; pos = If ( matchcase ; // do a Case Sensitive PatternCount Let( [ marker = "%!Case!%" ; // use a highly unlikely string find = marker & string ; // combine into new search string lst = Substitute ( lst ; string ; find ) ] ; // redefine the list // now we search for the combined string Position ( lst ; find ; 1 ; 1 ) ) ; // do a normal case Insensitive PatternCount Position ( lst ; string ; 1 ; 1 ) ) ] ; If ( pos ; PatternCount ( Left ( lst ; pos ) ; "¶" ) ; 0 ) ) Click to copy

Searches a Return delimited list 'list' for the occurrance of the given value.
Returns the 1-based indexnumber if found, 0 if value is not in the list.

Syntax: ListIndex ( list ; value ; matchcase )

In: list - the return delimited list to search
string - the string to look for in the item
matchcase - if True, the list is searched Case Sensitive
if False, a Case Insensitive search is performed

Return type: Number

 

Comments

		Peter Sijmons, Szienz Mar 10, 2014
list has become a reserved word in FMP13 and can no longer be used as param

		Luc Thomaere Apr 9, 2021
This function gives wrong results when searching for values that are substrings of other values: ListIndex ( "John¶Paula¶George¶Ringo¶Paul" ; "Paul" ; False ) doesn't give 5 Better is: (parameters: MyList, MyValue) Let ( [ marker = "@*!|" ; t = Substitute ( "¶" & ListID & "¶" ; "¶" & ID & "¶" ; "¶" & marker & "¶") ; t = If ( Left ( t ; 1 ) <> "¶" ; "¶" & t ; t ) ; pos = Position ( t ; marker ; 1 ; 1 ) ; index = PatternCount ( Left ( t ; pos ) ; "¶" ) ] ; index )

		Luc Thomaere Apr 9, 2021
Correction (with right parameter names): Let ( [ marker = "@*!|" ; t = Substitute ( "¶" & MyList & "¶" ; "¶" & MyValue & "¶" ; "¶" & marker & "¶") ; t = If ( Left ( t ; 1 ) <> "¶" ; "¶" & t ; t ) ; pos = Position ( t ; marker ; 1 ; 1 ) ; index = PatternCount ( Left ( t ; pos ) ; "¶" ) ] ; index )

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