regex - htaccess 301 redirect -- remove a string -

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i trying htaccess 301 redirect, stuck.

what want remove string in url, string is: style=5&

i want redirect pages may string in url removed. -- in advance.

from:

/viewtopic.php?style=5&f=45&t=1980&p=19136

to:

/viewtopic.php?f=45&t=1980&p=19136

you can use code in document_root/.htaccess file:

rewriteengine on  rewritecond %{query_string} ^(.+?&)?style=5(?:&(.*))?$ [nc] rewriterule ^viewtopic\.php$ %{request_uri}?%1%2 [r=302,nc,l]

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