Fix regex used to validate extended STIX type names

[invisig0th]

No description provided.

[codecov]

Codecov Report

Patch coverage: 33.33% and project coverage change: -4.50 ⚠️

Comparison is base (ed19fce) 97.27% compared to head (0aa33cc) 92.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3093      +/-   ##
==========================================
- Coverage   97.27%   92.78%   -4.50%     
==========================================
  Files         222      222              
  Lines       44035    44035              
==========================================
- Hits        42835    40856    -1979     
- Misses       1200     3179    +1979     

Flag	Coverage Δ
linux	92.78% <33.33%> (-4.40%)	⬇️
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/stormlib/stix.py	20.87% <33.33%> (-78.20%)	⬇️

... and 49 files with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.