<%@ page contentType="text/html;charset=Big5" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> CH7 - Fn_indexOf.jsp

\${fn:indexOf(string, substring)}


Input String Substring Result
${s1} castle ${fn:indexOf(s1, "castle")}
${s1} cloud ${fn:indexOf(s1, "cloud")}
${s1} null ${fn:indexOf(s1, undefined)}
${s1} empty string ${fn:indexOf(s1, "")}
null castle ${fn:indexOf(undefined, "castle")}
null empty string ${fn:indexOf(undefined, "")}