■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>