Result

jQuery

$("#autlink").each(function(){
   //http、httpsなどで始まる文字列を正規表現でリンクに置換する
   $(this).html( $(this).html().replace(/((http|https|ftp):\/\/[\w?=&.\/-;#~%-]+(?![\w\s?&.\/;#~%"=-]*>))/g, '<a href="$1">$1</a> ') );
    });

html

<p id="autlink">かちびと.netのアドレスは / です</p>

via

http://で始まる文字を自動リンクしよう

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