如果在使用C＃的字符串中找到特定关键字之前和之后插入空格

Question

我有一个愚蠢的字符串

Today the auto industry is booming. Automated machines are big part of it and it's working great. They are doing very big autonomous work.

我希望能够将关键字词典作为List<string>。

然后我想在我的文本中搜索这些关键字。如果找到关键字，请检查前后是否包含空格。如果是什么都不做。如果不包含则在之后添加空格。因此，关键字可以是开头中间或结尾的单词的一部分。所以基本上将关键词设为文本中的单个词。

关键字示例：auto, work, the

对于我的文字

Today the auto industry is booming. Automated machines are big part of it and it's working great. They are doing very big autonomous work.

结果应该是：

Today the auto industry is booming. Auto mated machines are big part of it and it's work ing great. The y are doing very big auto nomous work .

Answer 1

这是一种方法。它按关键字关键字，通过忽略大小写进行比较。如果找到关键字，则检查之前和/或之后是否有空格并添加空格。

public static string AddSpacesAroundWords(string text, List<string> words)
{
    foreach(string word in words) {
        int index = 0;
        while(index < text.Length) {
            index = text.IndexOf(word, index, StringComparison.CurrentCultureIgnoreCase);
            if(index == -1) {
                // no occurrence of this word anymore
                break;
            }
            // check if there is a space at the beginning of the word
            if(index > 0 && text[index - 1] != ' ') {
                text = text.Insert(index++ - 1, " ");
            }
            // check if there is a space at the end of the word
            if(index + word.Length < text.Length && text[index + word.Length] != ' ') {
                text = text.Insert(index++ + word.Length, " ");
            }
            index += word.Length;
        }
    }
    return text;
}

用法：

string original = "Today the auto industry is booming. Automated machines are big part of it and it's working great. They are doing very big autonomous work.";
var words = new List<string> { "auto", "work", "the" };
string result = AddSpacesAroundWords(original, words);
// result is now "Today the auto industry is booming. Auto mated machines are big part of it and it's work ing great. The y are doing very big auto nomous work ."

Answer 2

这只是GregaMohorko答案的返工/变化，我对此表示赞同：

private void Form1_Load(object sender, EventArgs e)
{
    tbKeywords.Text = "auto, work, the";
    textBox1.Text = "Today the auto industry is booming. Automated machines are big part of it and it's working great. They are doing very big autonomous work.";
}

private void button1_Click(object sender, EventArgs e)
{
    textBox2.Text = AddSpaceAroundWords(textBox1.Text, tbKeywords.Text);        
}

private string AddSpaceAroundWords(string sentence, string CommaSeparatedKeyWords)
{
    int index;
    string keyword;
    foreach (string key in CommaSeparatedKeyWords.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries))
    {
        index = 0;
        keyword = key.Trim();       
        while ((index = sentence.IndexOf(keyword, index, StringComparison.InvariantCultureIgnoreCase)) != -1)
        {
            if ((index > 0) && (sentence[index - 1] != ' '))
            {
                sentence = sentence.Insert(index++, " ");
            }
            if (((index + keyword.Length) < sentence.Length) && (sentence[index + keyword.Length] != ' ')) {
                sentence = sentence.Insert(index++ + keyword.Length, " ");
            }
            index += keyword.Length;
        }
    }
    return sentence;
}