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# update list of branches
git remote update origin --prune

# Поиск и удаление веток вида "feature/s9/67-link--dev" из ориджина с префиксом feature
git branch -r | awk -F/ '/\/feature/{print $2"/"$3"/"$4}' | xargs -I {} git push origin --delete {}  

# or remove only s12 branches
git branch -r | awk -F/ '/\/feature\/s12/{print $2"/s12/"$4}' | xargs -I {} git push origin --delete {}

# remove locally only s12 branches
git branch -a | grep feature/s12 | xargs git branch -d