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私はこの正規表現を使用しようとしています:
^[a-z0-9_-@]{3,15}$
@...しかし、符号のために例外がスローされます。@サインを受け入れるにはどうすればよいですか?
@
I have class (JavaBean if you want to call it like that)
class Tweet{ private millis; //number of millis since 1970 //other attributes and getters and setters, b