[Feature Request] Add Advanced Search in Reader

[otdftb-eng]

The search tool is too basic.

Could you implement a few useful features:

• Show a list of all occurences found for the searched word (and the possibility to click that list to jump to the location of that occurence in the pdf)
• possibility to search full words or parts of words
• possibility of a "case sensitive" search
• possibility of some basic regular expressions (match exact words, match all words, etc.)
• display how many occurences have been found

Thank you!