■スクリプト
<HTML> <HEAD> <TITLE>Sample</TITLE> </HEAD> <BODY bgColor="white"> <CENTER> <H1>leftContext</H1> </CENTER> <P> <SCRIPT Language="JavaScript"> <!-- myRE = new RegExp("(MZ)"); str = "SHARP!MZ-2861"; result = str.match(myRE); document.write("結果<B>"+result+"</B><BR>"); document.write("leftContext($`)の内容"+RegExp.leftContext.bold()+"<BR>"); // --> </SCRIPT> </BODY></HTML>