Cloning this repository:

git clone git://gitorious.org/android-on-freerunner/platform_external_libregex.git platform_external_libregex
cd platform_external_libregex

Add this repository as a remote to an existing local repository:

git remote add platform_external_libregex git://gitorious.org/android-on-freerunner/platform_external_libregex.git
git fetch platform_external_libregex
git checkout -b my-local-tracking-branch platform_external_libregex/master_or_other_branch