return null;
            }
            final Matcher matcher = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE).matcher(value);
            final StringBuffer buf = new StringBuffer(value.length() + 100);
            while (matcher.find()) {
                matcher.appendReplacement(buf, Matcher.quoteReplacement(highlightTagPre + matcher.group(0) + highlightTagPost));
            }

        });
    }

    /**
     * Processes virtual host configuration by applying a function to the matched virtual host key.
     *
     * @param <T> The return type of the function
     * @param func The function to apply to the virtual host key
     * @param defaultValue The default value to return if no virtual host matches
     * @return The result of applying the function, or the default value
     */

Shinsuke Sugaya <******@****.***> 1718631041 +0900

Shinsuke Sugaya <******@****.***> 1718631041 +0900

Shinsuke Sugaya <******@****.***> 1718631041 +0900

        key = virtualHostHelper.getVirtualHostKey();
        assertEquals("", key); // Still empty due to caching

        // Test caching by calling again - should return cached value
        key = virtualHostHelper.getVirtualHostKey();
        assertEquals("", key); // Still cached value
    }

    @Test
    public void test_getVirtualHostKey_withCaching() {
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {

igarashi <******@****.***> 1565681654 +0900

Shinsuke Sugaya <******@****.***> 1565835412 +0900

Shinsuke Sugaya <******@****.***> 1718631041 +0900

Shinsuke Sugaya <******@****.***> 1718631041 +0900