在大写字母前添加空格
在大写字母前添加空格
提问于 2008-11-07 16:33:54
给定字符串"ThisStringHasNoSpacesButItDoesHaveCapitals“，在大写字母前添加空格的最佳方式是什么？所以最后的字符串应该是"This string Has No Spaces But It So Capitals“
这是我对RegEx的尝试
System.Text.RegularExpressions.Regex.Replace(value, "[A-Z]", " $0")回答 25
Stack Overflow用户
发布于 2011-02-17 04:10:35
没有测试性能，但在linq中有一行：
var val = "ThisIsAStringToTest";
val = string.Concat(val.Select(x => Char.IsUpper(x) ? " " + x : x.ToString())).TrimStart(' ');Stack Overflow用户
发布于 2013-09-27 21:31:54
我知道这是一个旧的扩展，但这是我在需要时使用的扩展：
public static class Extensions
{
public static string ToSentence( this string Input )
{
return new string(Input.SelectMany((c, i) => i > 0 && char.IsUpper(c) ? new[] { ' ', c } : new[] { c }).ToArray());
}
}这将允许您使用MyCasedString.ToSentence()
Stack Overflow用户
发布于 2012-10-05 01:33:06
我打算基于Binary Worrier的代码做一个简单的扩展方法，它可以正确地处理首字母缩写，并且是可重复的(不会破坏已经间隔的单词)。这是我的结果。
public static string UnPascalCase(this string text)
{
if (string.IsNullOrWhiteSpace(text))
return "";
var newText = new StringBuilder(text.Length * 2);
newText.Append(text[0]);
for (int i = 1; i < text.Length; i++)
{
var currentUpper = char.IsUpper(text[i]);
var prevUpper = char.IsUpper(text[i - 1]);
var nextUpper = (text.Length > i + 1) ? char.IsUpper(text[i + 1]) || char.IsWhiteSpace(text[i + 1]): prevUpper;
var spaceExists = char.IsWhiteSpace(text[i - 1]);
if (currentUpper && !spaceExists && (!nextUpper || !prevUpper))
newText.Append(' ');
newText.Append(text[i]);
}
return newText.ToString();
}下面是这个函数通过的单元测试用例。我把tchrist建议的大多数案例都添加到了这个列表中。它没有通过的三个参数(两个只是罗马数字)被注释掉了：
Assert.AreEqual("For You And I", "ForYouAndI".UnPascalCase());
Assert.AreEqual("For You And The FBI", "ForYouAndTheFBI".UnPascalCase());
Assert.AreEqual("A Man A Plan A Canal Panama", "AManAPlanACanalPanama".UnPascalCase());
Assert.AreEqual("DNS Server", "DNSServer".UnPascalCase());
Assert.AreEqual("For You And I", "For You And I".UnPascalCase());
Assert.AreEqual("Mount Mᶜ Kinley National Park", "MountMᶜKinleyNationalPark".UnPascalCase());
Assert.AreEqual("El Álamo Tejano", "ElÁlamoTejano".UnPascalCase());
Assert.AreEqual("The Ævar Arnfjörð Bjarmason", "TheÆvarArnfjörðBjarmason".UnPascalCase());
Assert.AreEqual("Il Caffè Macchiato", "IlCaffèMacchiato".UnPascalCase());
//Assert.AreEqual("Mister Dženan Ljubović", "MisterDženanLjubović".UnPascalCase());
//Assert.AreEqual("Ole King Henry Ⅷ", "OleKingHenryⅧ".UnPascalCase());
//Assert.AreEqual("Carlos Ⅴº El Emperador", "CarlosⅤºElEmperador".UnPascalCase());
Assert.AreEqual("For You And The FBI", "For You And The FBI".UnPascalCase());
Assert.AreEqual("A Man A Plan A Canal Panama", "A Man A Plan A Canal Panama".UnPascalCase());
Assert.AreEqual("DNS Server", "DNS Server".UnPascalCase());
Assert.AreEqual("Mount Mᶜ Kinley National Park", "Mount Mᶜ Kinley National Park".UnPascalCase());页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/272633
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