Question

我正在尝试找到一种有效的方法来获取输入字符串并将每个标点符号（. : ? !）后面的第一个字母大写，后面跟一个空格。

输入：

“我吃了点东西。但我没有：相反，没有。你怎么看？一世不要想！请原谅我。“

输出：

“我吃了点什么。但我没有：相反，没有。你怎么看？一世不要想！请原谅。“

显而易见的是将它拆分然后将每个组的第一个字符大写，然后将所有内容连接起来。但这很丑陋。最好的方法是什么？（我在想Regex.Replace MatchEvaluator使用{{1}}将第一个字母大写，但希望获得更多想法）

谢谢！

Answer 1

快速简便：

static class Ext
{
    public static string CapitalizeAfter(this string s, IEnumerable<char> chars)
    {
        var charsHash = new HashSet<char>(chars);
        StringBuilder sb = new StringBuilder(s);
        for (int i = 0; i < sb.Length - 2; i++)
        {
            if (charsHash.Contains(sb[i]) && sb[i + 1] == ' ')
                sb[i + 2] = char.ToUpper(sb[i + 2]);
        }
        return sb.ToString();
    }
}

<强>用法：

string capitalized = s.CapitalizeAfter(new[] { '.', ':', '?', '!' });

Answer 2

试试这个：

string expression = @"[\.\?\!,]\s+([a-z])";
string input = "I ate something. but I didn't: instead, no. what do you think? i think not! excuse me.moi";
char[] charArray = input.ToCharArray();
foreach (Match match in Regex.Matches(input, expression,RegexOptions.Singleline))
{
    charArray[match.Groups[1].Index] = Char.ToUpper(charArray[match.Groups[1].Index]);
}
string output = new string(charArray);
// "I ate something. But I didn't: instead, No. What do you think? I think not! Excuse me.moi"

Answer 3

我使用扩展方法。

public static string CorrectTextCasing(this string text)
{
    //  /[.:?!]\\s[a-z]/ matches letters following a space and punctuation,
    //  /^(?:\\s+)?[a-z]/  matches the first letter in a string (with optional leading spaces)
    Regex regexCasing = new Regex("(?:[.:?!]\\s[a-z]|^(?:\\s+)?[a-z])", RegexOptions.Multiline);

    //  First ensure all characters are lower case.  
    //  (In my case it comes all in caps; this line may be omitted depending upon your needs)        
    text = text.ToLower();

    //  Capitalize each match in the regular expression, using a lambda expression
    text = regexCasing.Replace(text, s => (s.Value.ToUpper));

    //  Return the new string.
    return text;

}

然后我可以做以下事情：

string mangled = "i'm A little teapot, short AND stout. here IS my Handle.";
string corrected = s.CorrectTextCasing();
//  returns "I'm a little teapot, short and stout.  Here is my handle."

Answer 4

其中文本变量包含字符串

        string text = "I ate something. but I didn't: instead, no. what do you think? i think not! excuse me.moi";
        string[] punctuators = { "?", "!", ",", "-", ":", ";", "." };
        for (int i = 0; i< 7;i++)
        {
            int pos = text.IndexOf(punctuators[i]);
            while(pos!=-1)
            {
                text = text.Insert(pos+2, char.ToUpper(text[pos + 2]).ToString());
                text = text.Remove(pos + 3, 1);
                pos = text.IndexOf(punctuators[i],pos+1);
            }
        }

Answer 5

使用Regex / MatchEvaluator路线，您可以匹配

"[.:?!]\s[a-z]"

并将整场比赛大写。

C＃大写字符串，但仅在某些标点符号之后

5 个答案: