Modify decimal regex to accept positive exponent specifier #5649
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Which issue does this PR close?
Closes #5648
Rationale for this change
If users have float data in scientific format with a positive exponent specifier (e.g "3.106e+04"), the current csv inference mechanism does not work correctly. This change fixes that.
What changes are included in this PR?
Are there any user-facing changes?
This causes a change in schema inference behavior -- it's possible that some user relies on the fact that the current behavior is incorrect. I'm not sure what arrow's policy is around visible changes like this, so if this is change is not allowable I understand.