使用 C# 从字母数字字符串中拆分数字部分 [英] Split numeric part from alphanumeric string using C#

问题描述

我有字母数字字符串列表.例如:

I have alphanumeric string list. For example:

1A
2B
7K
10A

我只想获取数字部分然后比较它们，如果它小于 10，我不需要将它添加到另一个列表中.我想知道从字符串中拆分数字部分的正则表达式.任何帮助.到目前为止，我所做的是:

I want to get only the numeric part and then compare them, if it is less than 10 I need not to add it in another list. What I want to know the regex to split the numeric part from the string. Any help. What I have done till now is:

 if (x == y) // also handles null
            return 0;
        if (x == null)
            return -1;
        if (y == null)
            return +1;

        int ix = 0;
        int iy = 0;
        while (ix < x.Length && iy < y.Length)
        {
            if (Char.IsDigit(x[ix]) && Char.IsDigit(y[iy]))
            {
                // We found numbers, so grab both numbers
                int ix1 = ix++;
                int iy1 = iy++;
                while (ix < x.Length && Char.IsDigit(x[ix]))
                    ix++;
                while (iy < y.Length && Char.IsDigit(y[iy]))
                    iy++;
                string numberFromX = x.Substring(ix1, ix - ix1);
                string numberFromY = y.Substring(iy1, iy - iy1);

                // Pad them with 0's to have the same length
                int maxLength = Math.Max(
                    numberFromX.Length,
                    numberFromY.Length);
                numberFromX = numberFromX.PadLeft(maxLength, '0');
                numberFromY = numberFromY.PadLeft(maxLength, '0');

                int comparison = _CultureInfo
                    .CompareInfo.Compare(numberFromX, numberFromY);
                if (comparison != 0)
                    return comparison;
            }
            else
            {
                int comparison = _CultureInfo
                    .CompareInfo.Compare(x, ix, 1, y, iy, 1);
                if (comparison != 0)
                    return comparison;
                ix++;
                iy++;
            }
        }

但我不想让我的方法如此复杂.所以我需要一个正则表达式来拆分.

But I don't want to be so complex in my approach. So I need a regex to split.

推荐答案

尝试字符的 IsDigit 方法

Try IsDigit method of char

var number = int.Parse(new string(someString.Where(char.IsDigit).ToArray()));
if(number<10)
{
   someList.Add(number);
}

使用 All 和 IsDigit 您可以只取字符串的数字部分，然后将其解析为 int 并进行比较:) 无需使用正则表达式

using All and IsDigit you can take only numeric part of the string, then parse it to int and compare :) There is no need to use Regexes

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