Anchor CPE patterns

[tschmidtb51]

fixes #400

[ccoffin]

It appears that the upper cpe22and23 pattern match might need a tweak. Note that it contains a match for both cpe 2.2 and cpe 2.3. I included the anchors for both and now it appears to work as i would suspect. I am not a regex guru so let me know if i am missing something. See https://regex101.com/r/KluW0Y/1 for the updated pattern match.

[tschmidtb51]

@ccoffin If I didn't miss anything, then you changed it from ^((cpe2.2)|(cpe2.3))$ to ^(cpe2.2)$|^(cpe2.3)$. IMHO both are equivalent...

CSAF uses the following (which IIRC just swaps the CPE versions):
https://github.com/oasis-tcs/csaf/blob/1726fcf10d6e444e6e65a696ac9198c981858d23/csaf_2.1/json_schema/csaf_json_schema.json#L163