ZF-2386: Better description in exception
Zend_Cache's exception when an illegal id has been used should be better written. Instead of Zend_Cache_Exception: Invalid id or tag : must use only [a-zA-Z0-9_]
it would be better to have the illegal id also be written: Zend_Cache_Exception: Invalid id or tag 'my/false*\TAG' : must use only [a-zA-Z0-9_]
Otherwise it can be very painfull to search which of the 1000nd Cache id's is wrong. This would improve usability.