When I enter a command:
git tag -l
I get such results:
rc-0.9.0.0 rc-0.9.0.1 rc-0.9.0.10 rc-0.9.0.11 rc-0.9.0.12 rc-0.9.0.2
Adapt this perl script, which sorts tags that look like client_release/7.2/7.2.25, to your specific tagging scheme.
client_release/7.2/7.2.25