正则表达式工具类，里面有许多用javascr ipt编写验证函数，例如验证输入的字符串是否满足身份证格式、输入的字符串是否满足正整数格式等。-Regular expression tools class, there are many written in javascr ipt validation function, such as string input validation meets the identification format string entered is a positive integer format to meet the like.