URL Rewrite Filter not working with query parameters containing special characters

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What steps will reproduce the problem?
Referring to Conditions Based On URL Parameters, I’ve done something using 
UrlRewriteFilter which is actually required to make my site Google crawl-able. 
Here’s how it goes.

<rule enabled="true">
        <note>
            The rule means that requests to /test/status/ will be redirected to /rewrite-status
            the url will be rewritten.
        </note>
        <condition type="parameter" name="_escaped_fragment_" operator="equal">(apple|kiwi|orange)</condition>
            <from>^/mysite/(.+)/(.*)$</from>
            <to type="redirect">/mysite/%{parameter:_escaped_fragment_}</to>
    </rule>
It fails throwing java.lang.IllegalArgumentException: URLDecoder: Illegal hex 
characters in escape (%) pattern – %%7. As my variable contains underscores 
(_escaped_fragment_), where in it works fine with a parameter variable called 
‘friuit’.

What is the expected output? What do you see instead?
The url which should have been redirected to 

http://myurl.com/mysit/targetpage.html

It is going to 
http://myurl.com/mysite/%%7Bparameter:_escaped_fragment_%7D
As an error is shown in my server console.
 java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern – %%7.

What version of the product are you using? On what operating system?
Url Rewrite Filter 4.0.3

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 27 May 2014 at 2:11

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