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Copy(S; Index, Count: Integer): string
Delete(var S: string; Index, Count:Integer)
Insert(Source: string; var S: string; Index: Integer)
Pos(Substr: string; S: string): Integer
Length(a:string):integer
UpperCase(s:string) :string
LowerCase(s:string):string
CompareStr(s1,s2:string):integer
CompareText(s1,s2:string):integer
AnsiUpperCase(s:string):string
AnsiLowerCase(s:string):string
AnsiCompareStr(s1,s2:string):integer
AnsiCompareText(s1,s2:string):integer
Trim(s:string):string
TrimLeft(s:string):string
TrimRight(s:string):string
IntToStr(a:integer):string
IntToHex(value:integer;digits:integer):string
StrToInt(s:string):integer
StrToIntDef(s:string;default:integer):integer
FloatToStr(a:float):string