String manipulation: extracting a part of a string, text replacement, formatting to a given width, etc.

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Finding words with one vowel group

I am trying to use a command to find all words in a list of words with one group vowels. Like four, for and far, but also words like ore and or. What I got so far: grep -i ...
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Automatic replacement of strings in gedit

I want to replace some strings defined by me in gedit, after a word has been completed and/or the document has been saved. For example \ðrac should be replaced with \frac How do I do this in gedit or ...