If you wanted to remove a specific pattern in a list of files, like the ones below:

23_2020_03_01_article-three.md
22_2020_02_01_article-two.md
21_2020_01_01_article-one.md

You can simply do that using Regular Expressions and the rename tool:

rename 's/[0-9]+_[0-9]+_[0-9]+_[0-9]+_//' *.md

Now, the desired output should look like this:

article-three.md
article-two.md
article-one.md

This should come in handy if you're lazy to rename each file manually! :)