ADD 邮箱、登录名、手机号验证api

app/libs/custom_regexp.rb

@@ -1,6 +1,7 @@
 module CustomRegexp
   PHONE = /1\d{10}/
   EMAIL = /\A[a-zA-Z0-9]+([._\\]*[a-zA-Z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+\z/
+  LOGIN = /^(?!_)(?!.*?_$)[a-zA-Z0-9_-]+$/ #只含有数字、字母、下划线不能以下划线开头和结尾
   LASTNAME = /\A[a-zA-Z0-9\u4e00-\u9fa5]+\z/
   NICKNAME = /\A[\u4e00-\u9fa5_a-zA-Z0-9]+\z/
   PASSWORD = /\A[a-z_A-Z0-9\-\.!@#\$%\\\^&\*\)\(\+=\{\}\[\]\/",'_<>~\·`\?:;|]{8,16}\z/