Returns the substring of a specified length that appears at a specified position in a string.
function AnsiMidStr(const AText: AnsiString; const AStart: Integer; const ACount: Integer): AnsiString;
AnsiString AnsiMidStr(const AnsiString AText, const int AStart, const int ACount);
StrUtils
AnsiMidStr returns a substring Count characters at AText[AStart].
If AStart is larger than the length of AText, AnsiMidStr returns an empty string.
If Count specifies more characters than are available, only the characters from AText[AStart] to the end of AText are returned.
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