Must be an instance of RegExp or a string that does not generate an exception when creating a new RegExp

应该是缺少Pattern，试试这样：

{type:'regexp',required:true,message: '请输入正则表达式', trigger: 'blur', pattern: /\w+/g}

@jruif
type要改成 string才有效果
{type:'string',required:true,message: '请输入正则表达式', trigger: 'blur', pattern: /\w+/g}

[{ pattern: /^\d+$/, required: true, message: 'pattern这个字段就够了' }]

望文生义了。。原来 regexp是验证输入的内容是否是正则表达式