如何在 VB.NET 中使用内联正则表达式修饰符

How to use inline regex modifier in VB.NET

本文关键字：正则表达式 VB NET 更新时间：2023-09-26

我正在使用jquery validation进行客户端电子邮件验证。当然，我也有服务器端验证，并希望使用与jquery相同的正则表达式来验证服务器端的输入。

我在jquery validate的源代码中找到了这个正则表达式：

// http://docs.jquery.com/Plugins/Validation/Methods/email
        email: function( value, element ) {
            // contributed by Scott Gonzalez: http://projects.scottsplayground.com/email_address_validation/
            return this.optional(element) || /^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$/i.test(value);
        },

请注意正则表达式末尾的/i，以使整个事情不区分大小写。

我有一个复杂的网站，其中包含 c# 库 Ánd VB 库。

在这两个库中，我需要实现此电子邮件验证。

在 C# 中，我使用以下代码：

Regex RegexEmailAddress = new Regex(@"^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$", RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.IgnoreCase);

注意最后RegexOptions.IgnoreCase。

但是，在我的 VB 代码中，我需要一个包含正则表达式模式的字符串。

Public Const MAIL_REGEX As String = "^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$"

到目前为止，我找不到任何有效的正则表达式调整来使此正则表达式不区分大小写。

我尝试在字符串前面添加(?i)，但在我的网站上使用它时，它被记录为无效正则表达式。

还要在模式末尾添加/i，给出无效的正则表达式。

更新：我尝试了另一种带有内联正则表达式修饰符的方法，我在这个 SO 问题中找到了这种方法。

Case sensitive: ^[0-9]'s(lbs|kg|kgs)$
Case insensitive: (?i:^[0-9]'s(lbs|kg|kgs)$)

但它也不起作用。

这是我得到的javascript错误：

Uncaught SyntaxError: Invalid regular expression: /(?i:^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$)/: Invalid group

更新 2

我正在使用 RegularExpressionValidator

RegularExpressionValidator rxvalEmail = new RegularExpressionValidator();
rxvalEmail.ID = "rxvalEmail";
rxvalEmail.ValidationExpression = SomeHelperInVB.MAIL_REGEX;
rxvalEmail.ControlToValidate = "txtEmail";

那么如何使用内联正则表达式修饰符使我的正则表达式不区分大小写呢？还有其他解决方案可以解决这个问题吗？

我做了一个简单的控制台应用程序，通过使用（？i）它工作得很好：

Module Module1
Public Const MAIL_REGEX As String = "^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$"
Public Const MAIL_REGEX_I As String = "(?i)^((([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+('.([a-z]|'d|[!#'$%&''*'+'-'/='?'^_`{'|}~]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])+)*)|(('x22)(((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?((['x01-'x08'x0b'x0c'x0e-'x1f'x7f]|'x21|['x23-'x5b]|['x5d-'x7e]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(''(['x01-'x09'x0b'x0c'x0d-'x7f]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF]))))*((('x20|'x09)*('x0d'x0a))?('x20|'x09)+)?('x22)))@((([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|'d|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))'.)+(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])|(([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])([a-z]|'d|-|'.|_|~|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])*([a-z]|['u00A0-'uD7FF'uF900-'uFDCF'uFDF0-'uFFEF])))$"
Sub Main()
    Dim r_sensitive As New System.Text.RegularExpressions.Regex(MAIL_REGEX)
    Dim r_insensitive As New System.Text.RegularExpressions.Regex(MAIL_REGEX_I)
    ' Returns true
    Console.WriteLine("ok@ok.com: " + r_sensitive.IsMatch("ok@ok.com").ToString)
    ' Returns false
    Console.WriteLine("NOT_ok@ok.com: " + r_sensitive.IsMatch("NOT_ok@ok.com").ToString)
    ' Returns true
    Console.WriteLine("ok@ok.com: " + r_insensitive.IsMatch("ok@ok.com").ToString)
    ' Returns true
    Console.WriteLine("NOT_ok@ok.com: " + r_insensitive.IsMatch("NOT_ok@ok.com").ToString)
    Console.Read()
End Sub
End Module

更新：好的，所以你正在使用RegularExpressionValidator在客户端和服务器上进行验证。..由于VB-RegEx和Javascript-Regex之间的语法不同，我不确定是否有可能做你想做的事情。在 VB 中，您在表达式的开头使用（？i），而在 Javascript 中，您需要在构造表达式（http://www.w3schools.com/jsref/jsref_obj_regexp.asp）时添加/i 作为修饰符。

也许您需要使用另一个不需要"不区分大小写的修饰符"的表达式。这是来自Expresso（http://www.ultrapico.com/expresso.htm）：

([a-zA-Z0-9_'-'.]+)@(('[[0-9]{1,3}'.[0-9]{1,3}'.[0-9]{1,3}'.)|(([a-zA-Z0-9'-]+'.)+))([a-zA-Z]{2,4}|[0-9]{1,3})

或者，另一种选择是在当前表达式中将 [a-z] 替换为 [a-zA-Z]。

使用国际化域名时，这两个表达式都不起作用，例如"any.name@domännamn.se"（请注意域名中的"ä"）。

一些可能对其他人有帮助的信息：

我发现了为什么正则表达式修饰符在调试用于验证的客户端代码时不适用于 RegularExpressionValidator。

下面的代码显示了如何使用 RegularExpressionValidator 控件完成正则表达式的客户端验证：

function RegularExpressionValidatorEvaluateIsValid(val) {
var value = ValidatorGetValue(val.controltovalidate);
if (ValidatorTrim(value).length == 0)
    return true;
var rx = new RegExp(val.validationexpression); // Error:  Invalid regular expression:....
var matches = rx.exec(value);
return (matches != null && value == matches[0]);

}

new RegExp("pattern/i")的格式为：/pattern/i/

这确实没有有效的正则表达式。有效的正则表达式将是：/pattern/i

=> 结论：修饰符无法使用 RegularExpressionValidator。我可能会使用自定义验证器控件来编写自定义服务器和客户端代码。

另一种选择是在使用的正则表达式中用 [a-zA-Z] 替换[a-z]