UltraEdit, UltraCompare, UEStudio forums

Thanks You Very Much Mofi Sir. You always inspire me the way you explain solution.......... I am grateful to you for your help.

Hello, I have a problem, I want to replace/delete "n"th lines within 500+ files. For example how to remove/replace 51th line of the file. OR How can I delete everything after 51th line. I know its possible with regular expressions, but I don't know how to. *Nothing identical in all files. Thanks.