help in sed

hi all,

I am trying to replace all words containing underscore(s) using sed but I cannot. Every word containing underscores should be replaced with ---.

My text looks like:

Code:

This is VAR_1.

This is VAR_1_AND_VAR_2.

The output should be

Code:

This is ---.

This is ---.

I use the following command but I am unable to understand what is going wrong.

Code:

sed 's/[A-Z]+\_/---/g' file

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