applied this and it worked fine for my tests, but on jenkins I was still testing with 3.6 and it turns out that the re
module did not have a Patterns class, but instead it has _sre.SRE_Pattern so I will revert that small change in
validators.py for now.
In practice I think we have stopped building 3.6 wheels at present because I got some weird errors about failures from
the reportlab-mirror build wheels action.
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