I have following image url:
http://www.example.org/wp-content/blogs.dir/29/files/2013/02/Personalized-Results-Asterisk-600x417.png
Here url con
You can try
Regex:^(.*?)-\d+x\d+\.([^/]+)$
^(.*?)-\d+x\d+\.([^/]+)$
Replace with:$1$2
$1$2