git delete all tags matching a regex

this will delete all remote tags containig the "iap-copy" string (more complex cases can be achieved with egrep)

git clone myrepourl
cd myproject
git tag --list | grep iap-copy | sort > allnaughtytags.txt
for mytag in `cat allnaughtytags.txt`; do git push --delete origin $mytag ; done 

The method is very slow.... there are much faster ways, but this is very simple and reliable

tested with git 1.9.4