Your comments

You can already search for "\n" (newline) and "\t" (tab). This allows you for example to replace all tabs with spaces or replace one newline with two newline characters.
What's the problem with putting your files into different folders?
I assume you mean something like FireBug?

I'm not sure if this is even possible using the UIWebView that is provided by iOS. Maybe there's a JavaScript debugging library you can include in your website.
What exactly do you mean when you say "buffers"? I'm not familiar with this term in connection with regular expression search.
I plan to show a list of recently opened files when you tap on the file name. This should solve the problem.