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var
str1:string;
i,j:integer;
begin
str1:='dsf4654f6<ds>ad' ;
j:=pos('<',str1);//ÔÚ×Ö·û´®str1ÖвéÕÒ"<"
if j<>0 then //µÃµ½µÄjÊÇ×Ö·û´®ÖгöÏÖµÄλÖã¬ÊÇÕûÐÍ
showmessage('<'+'ÔÚµÚ'+inttostr(j)+'¸öλÖÃ'); //µÚÊ®¸öλÖÃ
end;
===============================================
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