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Description:

Checks whether character in specified position of string is equal to some other character.

Parameters:
text	String.
character	Character to test.
position	Position in string.

function
boolean CheckDigitMatch(string tstr, integer i)
begin
  boolean res;
  
  res = false;
  if (CharacterMatch(tstr, "9", i) or CharacterMatch(tstr, "8", i) or CharacterMatch(tstr, "7", i) or CharacterMatch(tstr, "6", i) or
      CharacterMatch(tstr, "5", i) or CharacterMatch(tstr, "4", i) or CharacterMatch(tstr, "3", i) or CharacterMatch(tstr, "2", i) or
      CharacterMatch(tstr, "1", i) or CharacterMatch(tstr, "0", i)) then 
  begin
    res = true;
  end;    
  CheckDigitMatch = res;
  return;
end; 

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