正则表达式执行子字符串操作 [英] Regular Expressions to perform Substring manipulation

问题描述

大家好，

我正在尝试编写正则表达式以在c#中进行子字符串匹配.
我想将以下示例转换为正则表达式以执行完全相同的操作

字符串a = 12345678912345;
字符串b = a.Substring(4，10);

有可能吗?

谢谢

Gerom

Hi all,

I am trying to write a regular expression to do a substring match in c#.
I want to convert the example below into a regular expression to do exactly the same thing

string a = 12345678912345;
string b = a.Substring(4, 10);

Is it possible?

Thanks

Gerom

推荐答案

是的，有可能.但是，这根本不是一个好主意.

这不是正则表达式的工作，它是子字符串函数.虽然您可以创建一个正则表达式来执行此操作，但与等效的string.Substring方法相比，它的读取和维护要困难得多.

正则表达式用于模式匹配，而不是字符串提取.有时候，使用螺丝刀比使用撬棍更好.

Yes, it is possible. However, it is not a good idea at all.

That is not a job for a regular expression, it is a substring function. While you could create a regex to do it, it would be a lot harder to read and maintain than the equivalent string.Substring method.

Regular expressions are for pattern matching, not string extraction. Sometimes, it is better to use a screwdriver, than to use a crowbar...

正如格里夫已经说过的，不要这样做，以防万一您好奇您该怎么做:

As Griff already said, don''t do it, bit just in case you got curious this is how you could do it:

Regex regex = new Regex(".{4,}(?<rest>.*)");
MatchCollection matchCollection=regex.Matches("1234567890"); 
foreach(Match match in matchCollection)
{
    Console.WriteLine("Rest: {0}", match.Groups["rest"]);
}

干杯！

Cheers!

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