How do I search and replace the contents of multiple Wordpress posts all at once?

Ok I have over 500 posts on my website (using wordpress). I trying to replace the < !--More--> tag in multiple posts to single line by itself. Example

This:

Start of post.......

< !---m开发者_如何学Core--> ...post continues...

To:

Start of post.........

< !---more-->

...post continues...

It would be great if there is no spacing between lines. Thanks in advance..

Search RegEx is a good plugin to be able to search and replace with Grep through all posts and pages.