Pool account resolution fails if pool account name contains numbers

[andreaceccanti]

When the pool account name contains numbers as the last digits of the name, the pool account resolution fails.

Example:
example12 linked to pool accounts example1201, example1202 fails resolution.

This problem is likely caused by this regexp:
https://github.com/argus-authz/argus-pep-server/blob/1_7/src/main/java/org/glite/authz/pep/obligation/dfpmap/DefaultPoolAccountResolver.java#L34