使用两个条件拆分字符串

Question

我有一个字符串，如下所示。

  

string sample =“class0 .calss1 .class2 .class3.class4 .class5 class6 .class7”;

我需要从此示例字符串创建一个WORDS列表。

WORD是一个以句点开头并以：

结尾的字符串

1. 空格或
2. 另一个时期或
3. 字符串结尾

注意：这里的关键点是 - 拆分基于两个标准 - 句号和空格

我有以下计划。它工作正常。但是，使用LINQ或Regular Expressions是否有更简单/更有效/更简洁的方法？

CODE

        List<string> wordsCollection = new List<string>();
        string sample = " class0 .calss1 .class2 .class3.class4  .class5 class6 .class7";

        string word = null;

        int stringLength = sample.Length;
        int currentCount = 0;

        if (stringLength > 0)
        {
            foreach (Char c in sample)
            {

                currentCount++;
                if (String.IsNullOrEmpty(word))
                {
                    if (c == '.')
                    {
                        word = Convert.ToString(c);
                    }
                }
                else
                {

                    if (c == ' ')
                    {
                        //End Criteria Reached
                        word = word + Convert.ToString(c);
                        wordsCollection.Add(word);
                        word = String.Empty;
                    }
                    else if (c == '.')
                    {
                        //End Criteria Reached
                        wordsCollection.Add(word);
                        word = Convert.ToString(c);
                    }
                    else
                    {
                        word = word + Convert.ToString(c);
                        if (stringLength == currentCount)
                        {
                            wordsCollection.Add(word);
                        }
                    }
                }

            }
        }

RESULT

        foreach (string wordItem in wordsCollection)
        {
            Console.WriteLine(wordItem);

        }



参考：

1. Splitting up a string, based on predicate
2. Is there a better way to get sub-sequences where each item matches a predicate?
3. Linq based generic alternate to Predicate<T>?

Answer 1

您可以使用正则表达式执行此操作。

<强>代码

Regex regex = new Regex(@"\.[^ .]+");
var matches = regex.Matches(sample);
string[] result = matches.Cast<Match>().Select(x => x.Value).ToArray();

查看在线工作：ideone

<强>结果

.calss1
.class2
.class3
.class4
.class5
.class7

正则表达式的说明

\.      Match a dot
[^. ]+  Negative character class - anything apart from space or dot (at least one)

相关

• Character Classes or Character Sets

Answer 2

string sample = " class0 .calss1 .class2 .class3.class4  .class5 class6 .class7";

string[] words = sample.Split(new char[] {'.'}).Skip(1).Select(x=> 
            "." + x.Split(new char[] {' '})[0].Trim()).ToArray();

EDIT错过了列表部分：

List<string> words = sample.Split(new char[] {'.'}).Skip(1).Select(x=> 
            "." + x.Split(new char[] {' '})[0].Trim()).ToList();

Answer 3

你需要保持。和空间？

如果没有，你可以使用：

sample.split(new char[]{" ", "."}).ToList();

这将为您提供字符串列表。

Answer 4

string sample = " class0 .calss1 .class2 .class3.class4 .class5 class6 .class7";
sample = Regex.Replace(sample, " ", String.Empty);
string[] arr = sample.Split(new char[] { '.' });