string.trim.fmfn

/*
=====================================================
string.trim( text; characters )

RETURNS:        (string) original string less supplied list of values
PARAMS:         text = string; characters = List()
DEPENDENCIES:   none
VERSION:        1.0
AUTHOR:         See notes
NOTES:
Adapted by Matt Petrowsky from
http://www.briandunning.com/cf/904
Compliments to Debi Fuchs, Aptworks Consulting
=====================================================
*/

Let([
        $var.text = text;
        var.default = List( " "; " "; "	"; "\¶"); // Default list of characters to remove (space, tab, return)
        var.characters = If ( IsEmpty( characters ); var.default; characters );

        var.function.parts = "[\"" & Substitute( var.characters; ¶; "\"; \"\"];¶[\"" ) & "\"; \"\"]";
        var.function.clean = "Substitute( $var.text; " & var.function.parts & " )"; // Strip out specified chars
        var.function.result = Evaluate( var.function.clean );

        var.char.first = Position( text; Left( var.function.result; 1 ); 0; 1 ); // Position of first (non cleaned) char
        var.char.last = Position( text; Right( var.function.result; 1 ); Length( text ); -1 ) // Position of last (non cleaned) char
    ];
    
        Case( var.char.first; Middle( text; var.char.first; var.char.last - var.char.first + 1 ) )

)