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I need to catch if my urls contain a small substr, keep the url as it is and rewrite only that small part, how can I accomplish this?

For example:

http://foobar.com/foo-bar-substrtocatch-baz 

should become

http://foobar.com/foo-bar-changedsubstr-baz

Thanks in advance...

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up vote 2 down vote accepted
rewrite    ^(.*)substrtocatch(.*)$    $1changedsubstr$2;
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