Spider Script Wordpress Websites

Hi! I'm looking for some kind of a website crawler or spider which bulk detects websites built with wordpress. As I'm not a programmer I will describe the procedure of such a script kind a like a non-programmer as follows: After entering a certain keyword the script should spider through the web collecting websites that match. In the next step the script should check wether a found website is built with wordpress or not. This could be done if the script checks the source code of a website there a typical wordpress strings in it, for example "/wp-content/" or "/wp-content/themes/" or "/wp-content-uploads/". In the next step the script should check wether there is a linked term "Impressum" in the source code or not. If so it should follow the link "impressum" and collect the Email-Address from this site or section. Finally the script should generate a plain text file with at least the following entries: "Website Title","URL","email-Address from Impressum" The background of all this is that I am a german wordpress webmaster offering certain wordpress services to my clients. So I would be able to get into contact with the owner of the detected websites. There are no illegal intentions in doing this!