c# - 如何从句子中所有数字的每个单词中获取第一个字符？

Question

我有一些句子，它们由单词和数字构成。我想从每个 word 中获取一个包含 1st char 的 string，all digit 并且这个词有 所有大写字母。我试过使用 Regex 但问题是，它没有给出 all digit 和 all upper case letters.

我的正则表达式在 Regex101 中.

我的解决方案是 DotNetFiddle .

代码:

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        List<string> list = new List<string> {"Freestyle steel","Freestyle Alloy","Trekking steel uk","Single speed","5 speed","15 speed","3 Speed internal gear with 55 coaster","MTB steel","Junior MTB"};
        foreach(string data in list)
        {
            string regex = @"(\b\w)|(\d+)";
            var matches = Regex.Matches(data, regex, RegexOptions.Multiline);
            string output = "";
            foreach(Match item in matches)
            {
                output += item.Groups[1];
            }
            Console.WriteLine(output);
        }
    }
}

Sample Input

Freestyle steel

Freestyle Alloy

Trekking steel uk

Single speed

5 speed

15 speed

3 Speed internal gear with 55 coaster

MTB steel

Junior MTB

Sample Output

Fs

FA

Tsu

Ss

5s

15s

3Sigw55c

MTBs

JMTB

Answer 1

您可以使用的正则表达式是

@"[0-9]+|\b(?:\p{Lu}+\b|\w)"

详细信息:

• [0-9]+ - 一个或多个数字
• | - 或者
• \b - 前导词边界
• (?:\p{Lu}+\b|\w) - 1+ 个大写字母后跟一个尾随单词边界 (\p{Lu}+\b) 或任何字符字符 (\w)。

参见 this solution :

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;

public class Test
{
    public static void Main()
    {
        var regex = @"[0-9]+|\b(?:\p{Lu}+\b|\w)";
        var list = new List<string> {"Freestyle steel","Freestyle Alloy","Trekking steel uk","Single speed","5 speed","15 speed","3 Speed internal gear with 55 coaster","MTB steel","Junior MTB"};
        foreach(var data in list)
        {
            var matches = Regex.Matches(data, regex).Cast<Match>().Select(m => m.Value.ToUpper());
            Console.WriteLine(string.Join("", matches));
        }
    }
}

输出:

FS
FA
TSU
SS
5S
15S
3SIGW55C
MTBS
JMTB