Recently, I need to mass replace some old text coding in many of my static html files. It will take many hours and days to replace the many html files which I have created for my computer website. Fortunately, I was able find a free program call Find and Replace which save me many hours and days as I can mass replace all those old text coding with some simple steps.
Find and Replace is really useful in such situation. It is a free open source program, you many download it if you have such a situation.
https://sourceforge.net/projects/findandreplace/