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I've written a script to convert 3 and 4 characters words, since they often are abreviations in the texts I work on. Here is the starting text : Diabetes - Hbp - Copd - I want to transform it to : Diabetes - HBP - COPD - My script is composed of two lines:

%s/\v<(\w)(\w)(\w) /\u\1\u\2\u\3/g

%s/\v<(\w)(\w)(\w)(\w) /\u\1\u\2\u\3\u\4/g

Which is working, but I guess there is a more elegant solution. How to make vim match and upcase only n to m characters words?

:%s/\<\w\{3,4}\> matches 3 or 4 characters words, but I can't find how to upcase my selection ...

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I would propose:

:%s/\<\w\{3,4}\>/\U\0/g
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    Thanks a lot, for the fast and accurate answer. I just found the whole match operator \0 and tried :%s/\<\w\{3,4}\>/\u\0/g but it only makes the first letter of the word uppercase ...
    – Vincent Willems
    Commented Aug 24, 2022 at 17:59
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    Your are welcome :-) you have also the \l and \L operators and as an alternative for \0 you have &.
    – Vivian De Smedt
    Commented Aug 24, 2022 at 18:16

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