RewriteRule ^ (/folder1/folder2/ [^_/] +) _ ([^_/] +) \ .htm$ http://www.newdomain.co.uk/folder1/folder2/$1-$2.htm [NC, R=301, l]
RewriteRule ^ (/folder1/folder2/ [^_/] +) _ ([^_/] +) _ ([^_/] +) \ .htm$ http://www.newdomain.co.uk/folder1/folder2/$1-$2-$3.htm
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