如题 说的详细点
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CANON_EQ: 考虑Unicode字符的规范等价。
Enables canonical equivalence.
When this flag is specified then two characters will be considered to match if, and only if, their full canonical decompositions match. The expression "a\u030A ", for example, will match the string "? " when this flag is specified. By default, matching does not take canonical equivalence into account.