I am trying to filter out words that are "all capital letters" using regex in unix : <p>I am searching here in stack but all the answers are only for those who only has a particular caps. What I want is a word/s in all caps.</p>

<p>For example: Abby ABBY aBbY SNOOPY doll</p>

<p>The output must be: ABBY SNOOPY</p>
