正则表达式限制带有换行符的字符串的字符串长度 [英] Regex to limit string length for strings with new line characters

问题描述

看起来像一个简单的任务-获得一个正则表达式，用于测试特定长度的字符串:^.{1,500} $

Looks like a simple task - get a regex that tests a string for particular length: ^.{1,500}$

但是，如果字符串中包含"\ r \ n"，则上述匹配总是失败！

But if a string has "\r\n" than the above match always fails!

正确的正则表达式应该如何接受新的换行字符作为字符串的一部分?

How should the correct regex look like to accept new line characters as part of the string?

我有一个< asp:TextBox TextMode ="Multiline"> ，并使用RegularExpressionValidator来检查用户键入内容的长度.

I have a <asp:TextBox TextMode="Multiline"> and use a RegularExpressionValidator to check the length of what user types in.

谢谢你，安德烈

推荐答案

验证输入时，可以使用 RegexOptions.Singleline 选项.它将输入视为单行语句，并按如下方式对其进行解析.

You could use the RegexOptions.Singleline option when validating input. This treats the input as a single line statement, and parses it as such.

否则，您可以尝试以下表达式:

Otherwise you could give the following expression a try:

^(.|\s){1,500}$

这应该在多行输入中起作用.

This should work in multiline inputs.

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