Renames multiple tags using regexp. Usage: git_rename_tags.sh $frompattern $topattern

git_rename_tags.sh

#!/bin/sh
shopt -s extglob
for tag in $(git tag -l)
do
    newtag=`echo "$tag" | sed -E "s/$1/$2/"`
    if [[ $tag != $newtag ]]; then
        git tag $newtag $tag
        git tag -d $tag
        git push origin :refs/tags/$tag
        git push --tags
    fi
done