Any reason why Apple Mail Search can only find PARTS of a zoom link?

I noticed that Apple Mail's "search" feature can find the Beginning (or Entirety) of a string of non-punctuation characters within a zoom link in an email.  It cannot find the Middles or Ends.  

E.g. if the link (in this made-up example) is:

…..zoom.us/j/83359956229?pwd=aXMpN0X6M6EvL2tUH1B5V2lvMkh2KF09

THEN: 

It can find “83359956229” and “8335” but not “9956” or “6229”

Likewise it can find “aXMpN0X6M6EvL2tUH1B5V2lvMkh2KF09”    and “aXMp”  but not “UH1B” or “KF09”

Why would this be?