How to remove strange space from text?

Question

bash

There is a strange gap in the text that does not lend itself to regular expressions.
The first example, a space entered from the keyboard:

echo -e " " | base64
IAo=

Second example: space from text:

echo -e " " | base64
IO+7vwo=

What is this gap in the text? and remove/replace/avoid it?

Answer 1

Understood. Windows problems.
dos2unix saves

Answer 2

open the file with a subline or vim, maybe there is not only a space, but also a special character, not all characters can be displayed in many encodings and even some editors.
For example, there are characters that are not visible even in phpmyadmin ;) but are visible in vim
, and there are symbols that are not visible in vim but visible in the subline, as a rule they are in the form of a certain icon.
Then get the hex16 of that character and do whatever you want with it.