features needed
a. Search Bar to enter the search keyword b. Search Type -- i. starts with ii. ends with iii. anywhere iv. exact match c. Highlight the text in the occurrences found d. Print the no of occurrences in brackets while typing e. import option to import text files f. import option to import .md files
If I have understood you correctly a.-d. formulate your need for a search bar. I believe NoteKit actually offers a very primitive search bar that allows you to look for strings in your current document. Since NoteKit just saves it's notes to your filesystem you can use g/re/p to do search for anything more complex far better than any integrated solution could ever be. But you'd have to figure out how to run grep on your Windows machine, since I doubt they'll ship it by default.
Again, your notes are just files stored in ~/.local/share/notekit on OSX and GNU/Linux and