如何验证应该以字符开头，下划线然后是字符的UserName? [英] How to validate UserName that should start with characters followed by underscore and then followed by characters?

问题描述

如何验证应以字符开头，下划线然后是字符的UserName?


谢谢...

How to validate UserName that should start with characters followed by underscore and then followed by characters??


Thanks...

推荐答案

尝试一下

try this

public bool IsAlphaNumericWithUnderscore(string input)
{
    return Regex.IsMatch(input, "^[a-zA-Z0-9_]+

"); }

"); }

或

or

bool result = input.All(c=>Char.IsLetterOrDigit(c) || c=='_');

您可以为此使用正则表达式.像这样的东西.

You can use the regular expression for this. something like this.

var regExp = new Regex("[a-zA-Z]+_[a-zA-Z]+");
Match match = regExp.Match(UserName);
if (!match.Success)
{
  //Invalidate.
  //return
}

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