lastIndexOf in JSTL or JSP

Question

Can I figure out lastIndexOf() function at JSTL or JSP ? I just found the method
int indexOf(java.lang.String, java.lang.String) in JSTL. Or has there anyway to work this ?

Answer 1

can try :

<c:set value="${fn:split('fooBar/BarFoo/Bar','/')}" var="separatorPosition" />
     <c:out value="${separatorPosition[fn:length(separatorPosition)-1]}">
   </c:out>

Answer 2

How about using fn:split and sum lengths (fn:length) of all components excluding the last one.
But it's much better to do all logic in backend, just add additional properties to your object.

Answer 3

Here's one that seems to work for me. Modify myStr and lastIndexOf to what you want.

    <!-- Prepare variables -->
    <c:set var="myStr" value="this_is my. string_ok"/>
    <c:set var="lastIndexOf" value="_"/>
    <c:set var="lastIndexFoundAt" value=""/>
    <c:set var="myStrSize" value="${fn:length(myStr) }"/>
    <c:set var="indexIn" value="0"/>
    <c:set var="indexOut" value="1"/>

    <!-- iterate through string -->
    <c:forEach var="i" begin="0" end="${myStrSize}">

            <c:if test="${indexOut <= myStrSize }">
                <c:set var="char" value="${fn:substring(myStr, indexIn, indexOut) }"/>
                <c:if test="${char == lastIndexOf }">
                    <c:set var="lastIndexFoundAt" value="${i}"/>
                </c:if>

                <c:set var="indexIn" value="${indexIn + 1 }"/> <!-- increment -->
                <c:set var="indexOut" value="${indexOut + 1 }"/> <!-- increment -->
            </c:if>

    </c:forEach>

to test the index, use

    <c:out value="${lastIndexFoundAt}/>