Mega Code Archive
FirstDelimiter Delphi Function Returns Index of the First Occurence in a String of the Characters Specified
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Title: FirstDelimiter Delphi Function - Returns Index of the First Occurence in a String of the Characters Specified
Submitted by Jens Borrisholt
In the RTL there's a LastDelimiter function which returns the index of the last occurence in a string of the characters cpecified.
What about the first delimiter - a function that would return the index of the first occurence in a string of the characters cpecified.
FirstDelimiter
Here's the function returning the index of the first character in a string specified by a set of characters - delimiters:
function FirstDelimiter(const Delimiters, S: string): Integer;
var
P, Q: PChar;
Len : Integer;
begin
Result := 0;
P := Pointer(Delimiters) ;
Q := Pointer(s) ;
Len := StrLen(Q) ;
while Result do
if (Q[Result] #0) and (StrScan(P, Q[Result]) nil) then
Exit
else
Inc(Result) ;
end;
Usage example:
//handles Edit1's OnChange event - gets the index of the first number character in a string
procedure TForm1.Edit1Change(Sender: TObject) ;
var
s : String;
i : Integer;
begin
i := FirstDelimiter('0123456789', (Sender as TEdit).Text) ;
Caption := Copy((Sender as TEdit).Text, 1, i) ;
end;
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