Delete Multiple git Branches with a Single Command

I've adopted a branching model similar to The Diaspora* Project in which branches are prefixed with feature/*, *bug/*, etc. I was looking to remove several feature branches and ren across the following command on Stack Overflow.

Consider feature to be a variable, replace feature with any string that is common among all the names of all branches to be deleted.

git branch -D $(printf "%s\n" $(git branch) | grep 'feature')

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