使用 C# 根据计数和单词拆分字符串

Question

我需要按单词拆分字符串，每行应有 25 个字符。例如：

string ORIGINAL_TEXT = "请编写一个程序，将此文本分成小块。每个块的最大长度应为 25 "

输出应该是：

“请写一个程序”，

“这破坏了这个文本”，

“分成小块。每个”，

“块应该有一个”，

“最大长度为25”

我尝试使用子字符串- 但它破坏了像

“请写一个程序” - 错误

“请写一个程序” - 正确

请写一个程序 - 只有 23 个字符，它可以需要更多 2 个字符，但它会破坏这个单词。

string[] splitSampArr = splitSamp.Split(',', '.', ';');
string[] myText = new string[splitSampArr.Length + 1];

int i = 0;
foreach (string splitSampArrVal in splitSampArr)
{
    if (splitSampArrVal.Length > 25)
    {
        myText[i] = splitSampArrVal.Substring(0, 25);
        i++;
    }
    myText[i] = splitSampArrVal;

    i++;
}

Answer 1

您可以通过以下方式实现这一目标：

@"(\b.{1,25})(?:\s+|$)"

请参阅正则表达式演示

This regex matches and captures into Group 1 any character but a newline (with .) preceded with a word boundary (so, we only start matching whole words), 1 to 25 occurrences (thanks to the limiting quantifier {1,25}), and then matches either 1 or more whitespace characters (with \s+) or the end of string ($).

See a code demo:

using System;
using System.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;
public class Test
{
    public static void Main()
    {
        var str = "Please write a program that breaks this text into small chucks. Each chunk should have a maximum length of 25 ";
        var chunks = Regex.Matches(str, @"(\b.{1,25})(?:\s+|$)")
                 .Cast<Match>().Select(p => p.Groups[1].Value)
                 .ToList();
        Console.WriteLine(string.Join("\n", chunks));
    }
}