Remove <200b> character from text file

character encodingcharactersencoding

I have a huge text file containing this string/character <200b> that I want to delete. I tried with sed but it didn't work.

sed 's/<200b>//g' file

The character never shows when I open the file with a graphic text editor like gedit, I see it with vim.

<200b> is a Unicode for "Zero Width Space". You won't find it as a string. You can pipe the character into sed like this for removal:

sed -i "s/$(echo -ne '\u200b')//g" file

sed -i will modify the file in-place.
$(...) is a Bash command substitution.
echo manual page:
- -n do not output the trailing newline
- -e enable interpretation of backslash escapes