grep/regex can't find accented word

Question

I\'m trying mount a regex that get some words on a file where all letters of this word match with a word pattern.

My problem is, the regex can\'t find accented words

Answer 1

I found a related question here that seems to work.

So if you try something like:

cat input/words.txt | LANG=C grep '^[éra]\{1,4\}$' > output/words_era.txt

Does that produce what you expect?