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bpo-25054, bpo-1647489: Added support of splitting on zerowidth patterns. (#4471)

Also fixed searching patterns that could match an empty string.
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Serhiy Storchaka committed
70d56fb52582d9d3f7c00860d6e90570c6259371
Parent: e69fbb6
Committed by GitHub <noreply@github.com> on 12/4/2017, 12:29:05 PM