As far as I can see from the screen captures calibre is doing exactly what you asked it to do. For example, in screen capture 3 you are telling calibre to remove every character in author because in regular expression mode '.' matches anything. In screen capture 4 you are telling calibre to look for the string '[lots of accented characters]' in character mode and as expected calibre didn't find that string so it did nothing. In screen capture 2 you asked calibre to replace ó with o, which is what it did.
Can you explain what you want to do, what you told calibre to do, and what calibre did?
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