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我用作^[a-zA-Z0-9]$密码的正则表达式，当我插入空格并提交表单时，允许输入密码。
^[a-zA-Z0-9]$
@Assert\NotBlank()是输出消息“密码不应为空”。
@Assert\NotBlank()
如何在正则表达式中解决这个问题？