src/components/src/main/java/org/apache/jmeter/extractor/XPath2Extractor.java [78:118]:
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    private static String concat(String s1, String s2){
        return s1 + "_" + s2; // $NON-NLS-1$
    }

    private static String concat(String s1, int i){
        return s1 + "_" + i; // $NON-NLS-1$
    }

    /**
     * Do the job - extract value from (X)HTML response using XPath Query.
     * Return value as variable defined by REFNAME. Returns DEFAULT value
     * if not found.
     */
    @Override
    public void process() {
        JMeterContext context = getThreadContext();
        final SampleResult previousResult = context.getPreviousResult();
        if (previousResult == null){
            return;
        }
        JMeterVariables vars = context.getVariables();
        String refName = getRefName();
        vars.put(refName, getDefaultValue());
        final String matchNR = concat(refName,REF_MATCH_NR);
        int prevCount=0; // number of previous matches
        try {
            prevCount=Integer.parseInt(vars.get(matchNR));
        } catch (NumberFormatException e) {
            // ignored
        }

        vars.put(matchNR, "0"); // In case parse fails // $NON-NLS-1$
        vars.remove(concat(refName,"1")); // In case parse fails // $NON-NLS-1$

        int matchNumber = getMatchNumber();
        List<String> matches = new ArrayList<>();
        try{
            if (isScopeVariable()){
                String inputString=vars.get(getVariableName());
                if(inputString != null) {
                    if(inputString.length()>0) {
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src/components/src/main/java/org/apache/jmeter/extractor/XPathExtractor.java [93:132]:
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    private static String concat(String s1, String s2){
        return s1 + "_" + s2; // $NON-NLS-1$
    }

    private static String concat(String s1, int i){
        return s1 + "_" + i; // $NON-NLS-1$
    }

    /**
     * Do the job - extract value from (X)HTML response using XPath Query.
     * Return value as variable defined by REFNAME. Returns DEFAULT value
     * if not found.
     */
    @Override
    public void process() {
        JMeterContext context = getThreadContext();
        final SampleResult previousResult = context.getPreviousResult();
        if (previousResult == null){
            return;
        }
        JMeterVariables vars = context.getVariables();
        String refName = getRefName();
        vars.put(refName, getDefaultValue());
        final String matchNR = concat(refName,REF_MATCH_NR);
        int prevCount=0; // number of previous matches
        try {
            prevCount=Integer.parseInt(vars.get(matchNR));
        } catch (NumberFormatException e) {
            // ignored
        }
        vars.put(matchNR, "0"); // In case parse fails // $NON-NLS-1$
        vars.remove(concat(refName,"1")); // In case parse fails // $NON-NLS-1$

        int matchNumber = getMatchNumber();
        List<String> matches = new ArrayList<>();
        try{
            if (isScopeVariable()){
                String inputString=vars.get(getVariableName());
                if(inputString != null) {
                    if(inputString.length()>0) {
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