熟悉正则表达式的朋友快进来呀

Question

$str=preg_replace(">.* abc.*<"/gi,">.*CCC.*<",$str);

Answer 1

$str = '<img src="abc def abc fsdae" abc> abc f abc gf<abcd>';
preg_match_all('/>(.*)</i',$str,$getstr);
$getstr = preg_replace('/abc/i',"CCC",$getstr[1][0]);
$str = preg_replace('/>(.*)</iU',">".$getstr."<",$str);
echo "$str";

Answer 2

<%
$str='<img  src="abc  def  abc  fsdae"  abc>  abc  f  abc  gf<abcd>';
$str=preg_replace("/(?!(?<=<)[^<>]*?)abc(?!([^<>]*(?=>)))/Uisx","CCC",$str);
echo htmlspecialchars($str);
%>