^(?![0-9]+$)(?![a-zA-Z]+$)(?!([^(0-9a-zA-Z)]|[\(\)])+$)([^(0-9a-zA-Z)]|[\(\)]|[a-zA-Z]|[0-9]){6,}$
正则表达式
原文：http://www.cnblogs.com/cara-front-end/p/5915709.html
