说明：  正则表达式学习资料之表单验证。 表单的验证一直是网页设计者头痛的问题，表单验证类 Validator就是为解决这个问题而写的，旨在使设计者从纷繁复杂的表单验证中解放出来，把精力集中于网页的设计和功能上的改进上。
(Regular expression learning data forms authentication. Forms authentication has been a headache for web page designers, Forms Authentication type Validator is to solve this problem and written to enable the designer from complicated forms authentication liberate, to focus on the web page design and functional improvement.)