在C#中提取字符串末尾的数字 [英] Extract number at end of string in C#

问题描述

可能是对此进行了一点分析，但是stackoverflow如何建议是返回字符串末尾包含的整数的最佳方法.

Probably over analysing this a little bit but how would stackoverflow suggest is the best way to return an integer that is contained at the end of a string.

到目前为止，我已经考虑过使用一个简单的循环，LINQ和regex，但是我很好奇我将从社区中得到什么方法.显然，这不是一个很难解决的问题，但可以在解决方案中分配一定的差异.

Thus far I have considered using a simple loop, LINQ and regex but I'm curious what approaches I'll get from the community. Obviously this isn't a hard problem to solve but could have allot of variance in the solutions.

因此，更具体地说，您将如何创建一个函数来返回附加在任意长字符串末尾的任意长整数/长整数?

So to be more specific, how would you create a function to return an arbitrarily long integer/long that is appended at the end of an arbitrarily long string?

CPR123 => 123
ABCDEF123456 => 123456

推荐答案

使用以下正则表达式:

\d+$

var result = Regex.Match(input, @"\d+$").Value;

或使用Stack，可能更有效:

var stack = new Stack<char>();

for (var i = input.Length - 1; i >= 0; i--)
{
    if (!char.IsNumber(input[i]))
    {
        break;
    }

    stack.Push(input[i]);
}

var result = new string(stack.ToArray());

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