VB6和C＃正则表达式 [英] VB6 and C# regexes

问题描述

我需要将一个VB6（我不熟悉）项目转换为C＃4.0。该项目包含一些字符串验证的正则表达式。

I need to convert a VB6(which I'm not fammiliar with) project to C# 4.0 one. The project contains some regexes for string validation.

我需要知道正则表达式在这两种情况下的行为是否相同，所以如果我只是从VB6项目复制regex字符串，到C＃项目，他们会工作相同吗？

I need to know if the regexes behave the same in both cases, so if i just copy the regex string from the VB6 project, to the C# project, will they work the same?

我有一个正则表达式的基本知识，我可以只读一个什么，但对于风味等，

I have a basic knowledge of regexes and I can just about read what one does, but for flavors and such, that's a bit over my head at the moment.

例如，这两行是等价的吗？

For example, are these 2 lines equivalent?

VB6 ：

isStringValid = (str Like "*[!0-9A-Z]*")

C＃：

isStringValid = Regex.IsMatch(str, "*[!0-9A-Z]*");

$ b

谢谢！

Thanks!

推荐答案

旧的VB Like 运算符，尽管出现，不是正则表达式接口。它更多是一个glob模式匹配器。请参见 http://msdn.microsoft.com/en-us/library/swf8kaxw.aspx

The old VB Like operator, despite appearances, is not a regular expression interface. It's more of a glob pattern matcher. See http://msdn.microsoft.com/en-us/library/swf8kaxw.aspx

在您的示例中：

Like "*[!0-9A-Z]*"

匹配以任意字符（零个或多个）那么不会匹配中间某处的字母数字字符。此正则表达式为：

Matches strings that start and end with any character (zero or more), then doesn't match an alphanumeric character somewhere in the middle. The regular expression for this would be:

/.*[^0-9A-Z].*/

---

EDIT ，两者不能互换使用。但是，将 Like 的操作数转换为正确的正则表达式相当容易：

---

EDIT To answer your question: No, the two can't be used interchangeably. However, it's fairly easy to convert Like's operand into a proper regular expression:

Like       RegEx
========== ==========
?          .
*          .*
#          \d
[abc0-9]   [abc0-9]
[!abc0-9]  [^abc0-9]

这里有一些注意事项，但这应该让你开始，并且覆盖大多数情况。

There are a few caveats to this, but that should get you started and cover most cases.

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