Question

我需要确认域扩展名是否存在。

到目前为止，我无法获得域名扩展名

的匹配

域名可以包含通配符：gmail.com，msn.com，mac.com，comcast.net

    DomainPartOfEmail = Right(temp, (Len(temp) - temp.LastIndexOf("@") - 1))
    If Regex.IsMatch(DomainPartOfEmail, "*.edu? | *.com? | *.net? | *.org?", RegexOptions.IgnoreCase) Then
        ValidDomain = True
    End If

Answer 1

如果域名仅来自这些域名（edu，com，net，org），请使用此域名：

".*\.(edu|com|net|org)$"

正则表达式的解释：

NODE                     EXPLANATION
--------------------------------------------------------------------------------
  .*                       any character except \n (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \.                       '.'
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    edu                      'edu'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    com                      'com'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    net                      'net'
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    org                      'org'
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string

正则表达式匹配域扩展

1 个答案: