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'\w' 可以用来代替 [a-zA_Z0-9_]。我不需要“_”下划线。字母和数字的类是什么?
空无一人。使用[a-zA-Z0-9].
[a-zA-Z0-9]
将正则表达式[\da-z]与正则表达式选项一起使用ignoreCase
[\da-z]
ignoreCase