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* Add character property expression (Meet RL1.2 of UTS #18 partially)Ryo Nihei2021-04-301-0/+4089
\p{property name=property value} matches a character has the property. When the property name is General_Category, it can be omitted. That is, \p{Letter} equals \p{General_Category=Letter}. Currently, only General_Category is supported. This feature meets RL1.2 of UTS #18 partially. RL1.2 Properties: https://unicode.org/reports/tr18/#RL1.2