help about a rewrite rule

[tech user <techwww@xxxxxxxxxxxx>]

Hello,

I need to rewrite a request url,but I'm not sure how to do it correctly.
The incoming url form is like,

http://www.example.com/script?param1=xx&param2=yy

The desired rewritten url is,

http://www.example.com/xx_yy.html


Please help me the correct syntax.Thanks in advance.



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