RegularEx pressionValidator不开火白色空间进入 [英] RegularExpressionValidator not firing on white-space entry

问题描述

我想验证只包含数字串。容易验证？我说RegularEx pressionValidator，与ValidationEx pression =/ D +。

I want to validate string containing only numbers. Easy validation? I added RegularExpressionValidator, with ValidationExpression="/d+".

看起来不错 - 但只输入空间时，没有验证！甚至很多空间被验证还好。我不需要这是强制性的。

Looks okay - but nothing validated when only space is entered! Even many spaces are validated okay. I don't need this to be mandatory.

我可以修剪服务器上，但不能经常EX pression做的一切！

I can trim on server, but cannot regular expression do everything!

推荐答案

这是由设计，而且往往引发许多人赶走。该RegularEx pressionValidator不会使现场强制性，并允许它是空白的，并接受空格。该\\ D +格式是正确的。即使使用^ \\ D + $将导致允许空白的同样的问题。迫使这禁止空白，唯一的方法是还包括一个RequiredFieldValidator在同一控制操作。

This is by design and tends to throw many people off. The RegularExpressionValidator does not make a field mandatory and allows it to be blank and accepts whitespaces. The \d+ format is correct. Even using ^\d+$ will result in the same problem of allowing whitespace. The only way to force this to disallow whitespace is to also include a RequiredFieldValidator to operate on the same control.

这是每<一个href=\"http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.regularex$p$pssionvalidator.aspx\">RegularEx$p$pssionValidator文档，其中规定：

验证成功，如果输入
  控制是空的。如果值
  所需的相关输入
  控制，使用RequiredFieldValidator
  控制除
  RegularEx pressionValidator控制。

Validation succeeds if the input control is empty. If a value is required for the associated input control, use a RequiredFieldValidator control in addition to the RegularExpressionValidator control.

如预期定期EX pression领域中的code-后面检查将工作;这仅仅是与RegularEx pressionValidator的问题。所以你可以想见，使用的CustomValidator，而不是说 args.IsValid = Regex.IsMatch（txtInput.Text，@^ \\ D + $），如果它包含空格那么它将返回false。但是，如果是这样的话，为什么不直接使用按照文档的RequiredFieldValidator，避免编写自定义code？又一个的CustomValidator意味着强制回发（除非您指定具有同等的JavaScript正则表达式客户端验证脚本）。

A regular expression check of the field in the code-behind would work as expected; this is only an issue with the RegularExpressionValidator. So you could conceivably use a CustomValidator instead and say args.IsValid = Regex.IsMatch(txtInput.Text, @"^\d+$") and if it contained whitespace then it would return false. But if that's the case why not just use the RequiredFieldValidator per the documentation and avoid writing custom code? Also a CustomValidator means a mandatory postback (unless you specify a client validation script with equivalent javascript regex).

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