A system and method of identifying a changed element within a target web page is disclosed. A pre-region longest matching segment of the pre-region that matches a pre-region segment of a pre-region of a source web page is identified within a pre-region of the target page. A post-region longest matching segment of the post-region that matches a post-region segment of the post-region of a source web page is identified within a post-region of the target page. The changed element in the target web page is identified that is between the pre-region longest matching segment and the post-region longest matching segment in response to the pre-region longest matching segment being determined to be within a pre-defined distance of the post-region longest matching segment.