你怎么能将一个“大写”分隔的字符串分割成一个数组?

How do I go from this string: "ThisIsMyCapsDelimitedString"

如何从这个字符串开始:"ThisIsMyCapsDelimitedString"

...to this string: "This Is My Caps Delimited String"

…对于这个字符串:“这是我的大写Delimited字符串”

Fewest lines of code in VB.net is preferred but C# is also welcome.

VB.net中最少的代码行是首选，但c#也是受欢迎的。

Cheers!

干杯!

16 个解决方案

#1

160

I made this a while ago. It matches each component of a CamelCase name.

这是我刚才做的。它匹配CamelCase名称的每个组件。

/([A-Z]+(?=$|[A-Z][a-z])|[A-Z]?[a-z]+)/g

For example:

例如:

"SimpleHTTPServer" => ["Simple", "HTTP", "Server"]
"camelCase" => ["camel", "Case"]

To convert that to just insert spaces between the words:

将其转换为仅在单词之间插入空格:

Regex.Replace(s, "([a-z](?=[A-Z])|[A-Z](?=[A-Z][a-z]))", "$1 ")

If you need to handle digits:

如果你需要处理数字:

/([A-Z]+(?=$|[A-Z][a-z]|[0-9])|[A-Z]?[a-z]+|[0-9]+)/g

Regex.Replace(s,"([a-z](?=[A-Z]|[0-9])|[A-Z](?=[A-Z][a-z]|[0-9])|[0-9](?=[^0-9]))","$1 ")

#2

Regex.Replace("ThisIsMyCapsDelimitedString", "(\\B[A-Z])", " $1")

#3

Great answer, MizardX! I tweaked it slightly to treat numerals as separate words, so that "AddressLine1" would become "Address Line 1" instead of "Address Line1":

伟大的回答,MizardX !我稍微调整了一下，把数字作为单独的单词，这样“AddressLine1”就变成了“地址1”而不是“AddressLine1”:

Regex.Replace(s, "([a-z](?=[A-Z0-9])|[A-Z](?=[A-Z][a-z]))", "$1 ")

#4

Just for a little variety... Here's an extension method that doesn't use a regex.

只是为了一点变化……这里有一个不使用正则表达式的扩展方法。

public static class CamelSpaceExtensions
{
    public static string SpaceCamelCase(this String input)
    {
        return new string(InsertSpacesBeforeCaps(input).ToArray());
    }

    private static IEnumerable<char> InsertSpacesBeforeCaps(IEnumerable<char> input)
    {
        foreach (char c in input)
        {
            if (char.IsUpper(c)) 
            { 
                yield return ' '; 
            }

            yield return c;
        }
    }
}

#5

Grant Wagner's excellent comment aside:

Grant Wagner的精彩评论:

Dim s As String = RegularExpressions.Regex.Replace("ThisIsMyCapsDelimitedString", "([A-Z])", " $1")

#6

I needed a solution that supports acronyms and numbers. This Regex-based solution treats the following patterns as individual "words":

我需要一个支持首字母缩写和数字的解决方案。这个基于regex的解决方案将以下模式视为单个“单词”:

A capital letter followed by lowercase letters
大写字母后面是小写字母。
A sequence of consecutive numbers
连续数的序列。
Consecutive capital letters (interpreted as acronyms) - a new word can begin using the last capital, e.g. HTMLGuide => "HTML Guide", "TheATeam" => "The A Team"
连续的大写字母(解释为首字母缩写)-一个新词可以开始使用最后的资本，例如HTMLGuide => "HTML Guide"， "TheATeam" => " the a Team"

You could do it as a one-liner:

你可以这样做:

Regex.Replace(value, @"(?<!^)((?<!\d)\d|(?(?<=[A-Z])[A-Z](?=[a-z])|[A-Z]))", " $1")

A more readable approach might be better:

一种可读性更好的方法可能会更好:

using System.Text.RegularExpressions;

namespace Demo
{
    public class IntercappedStringHelper
    {
        private static readonly Regex SeparatorRegex;

        static IntercappedStringHelper()
        {
            const string pattern = @"
                (?<!^) # Not start
                (
                    # Digit, not preceded by another digit
                    (?<!\d)\d 
                    |
                    # Upper-case letter, followed by lower-case letter if
                    # preceded by another upper-case letter, e.g. 'G' in HTMLGuide
                    (?(?<=[A-Z])[A-Z](?=[a-z])|[A-Z])
                )";

            var options = RegexOptions.IgnorePatternWhitespace | RegexOptions.Compiled;

            SeparatorRegex = new Regex(pattern, options);
        }

        public static string SeparateWords(string value, string separator = " ")
        {
            return SeparatorRegex.Replace(value, separator + "$1");
        }
    }
}

Here's an extract from the (XUnit) tests:

以下是(XUnit)测试的摘录:

[Theory]
[InlineData("PurchaseOrders", "Purchase-Orders")]
[InlineData("purchaseOrders", "purchase-Orders")]
[InlineData("2Unlimited", "2-Unlimited")]
[InlineData("The2Unlimited", "The-2-Unlimited")]
[InlineData("Unlimited2", "Unlimited-2")]
[InlineData("222Unlimited", "222-Unlimited")]
[InlineData("The222Unlimited", "The-222-Unlimited")]
[InlineData("Unlimited222", "Unlimited-222")]
[InlineData("ATeam", "A-Team")]
[InlineData("TheATeam", "The-A-Team")]
[InlineData("TeamA", "Team-A")]
[InlineData("HTMLGuide", "HTML-Guide")]
[InlineData("TheHTMLGuide", "The-HTML-Guide")]
[InlineData("TheGuideToHTML", "The-Guide-To-HTML")]
[InlineData("HTMLGuide5", "HTML-Guide-5")]
[InlineData("TheHTML5Guide", "The-HTML-5-Guide")]
[InlineData("TheGuideToHTML5", "The-Guide-To-HTML-5")]
[InlineData("TheUKAllStars", "The-UK-All-Stars")]
[InlineData("AllStarsUK", "All-Stars-UK")]
[InlineData("UKAllStars", "UK-All-Stars")]

#7

For more variety, using plain old C# objects, the following produces the same output as @MizardX's excellent regular expression.

对于更多样化的，使用普通的c#对象，下面的输出与@MizardX的优秀正则表达式产生相同的输出。

public string FromCamelCase(string camel)
{   // omitted checking camel for null
    StringBuilder sb = new StringBuilder();
    int upperCaseRun = 0;
    foreach (char c in camel)
    {   // append a space only if we're not at the start
        // and we're not already in an all caps string.
        if (char.IsUpper(c))
        {
            if (upperCaseRun == 0 && sb.Length != 0)
            {
                sb.Append(' ');
            }
            upperCaseRun++;
        }
        else if( char.IsLower(c) )
        {
            if (upperCaseRun > 1) //The first new word will also be capitalized.
            {
                sb.Insert(sb.Length - 1, ' ');
            }
            upperCaseRun = 0;
        }
        else
        {
            upperCaseRun = 0;
        }
        sb.Append(c);
    }

    return sb.ToString();
}

#8

Below is a prototype that converts the following to Title Case:

下面是一个原型，它将以下内容转换为标题案例:

snake_case
snake_case
camelCase
camelCase
PascalCase
PascalCase
sentence case
句子中
Title Case (keep current formatting)
标题案例(保持当前格式)

Obviously you would only need the "ToTitleCase" method yourself.

显然，你自己只需要“ToTitleCase”方法。

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        var examples = new List<string> { 
            "THEQuickBrownFox",
            "theQUICKBrownFox",
            "TheQuickBrownFOX",
            "TheQuickBrownFox",
            "the_quick_brown_fox",
            "theFOX",
            "FOX",
            "QUICK"
        };

        foreach (var example in examples)
        {
            Console.WriteLine(ToTitleCase(example));
        }
    }

    private static string ToTitleCase(string example)
    {
        var fromSnakeCase = example.Replace("_", " ");
        var lowerToUpper = Regex.Replace(fromSnakeCase, @"(\p{Ll})(\p{Lu})", "$1 $2");
        var sentenceCase = Regex.Replace(lowerToUpper, @"(\p{Lu}+)(\p{Lu}\p{Ll})", "$1 $2");
        return new CultureInfo("en-US", false).TextInfo.ToTitleCase(sentenceCase);
    }
}

The console out would be as follows:

控制台输出如下:

THE Quick Brown Fox
The QUICK Brown Fox
The Quick Brown FOX
The Quick Brown Fox
The Quick Brown Fox
The FOX
FOX
QUICK

Blog Post Referenced

博客文章引用

#9

string s = "ThisIsMyCapsDelimitedString";
string t = Regex.Replace(s, "([A-Z])", " $1").Substring(1);

#10

Regex is about 10-12 times slower than a simple loop:

Regex比一个简单的循环慢10-12倍:

    public static string CamelCaseToSpaceSeparated(this string str)
    {
        if (string.IsNullOrEmpty(str))
        {
            return str;
        }

        var res = new StringBuilder();

        res.Append(str[0]);
        for (var i = 1; i < str.Length; i++)
        {
            if (char.IsUpper(str[i]))
            {
                res.Append(' ');
            }
            res.Append(str[i]);

        }
        return res.ToString();
    }

#11

Naive regex solution. Will not handle O'Conner, and adds a space at the start of the string as well.

天真的正则表达式的解决方案。将不会处理O'Conner，并在字符串的开始处添加一个空格。

s = "ThisIsMyCapsDelimitedString"
split = Regex.Replace(s, "[A-Z0-9]", " $&");

#12

There's probably a more elegant solution, but this is what I come up with off the top of my head:

也许有一个更优雅的解决方案，但这就是我的想法:

string myString = "ThisIsMyCapsDelimitedString";

for (int i = 1; i < myString.Length; i++)
{
     if (myString[i].ToString().ToUpper() == myString[i].ToString())
     {
          myString = myString.Insert(i, " ");
          i++;
     }
}

#13

Try to use

尝试使用

"([A-Z]*[^A-Z]*)"

The result will fit for alphabet mix with numbers

这个结果将适合字母表与数字的混合。

Regex.Replace("AbcDefGH123Weh", "([A-Z]*[^A-Z]*)", "$1 ");
Abc Def GH123 Weh  

Regex.Replace("camelCase", "([A-Z]*[^A-Z]*)", "$1 ");
camel Case

#14

Implementing the psudo code from: https://*.com/a/5796394/4279201

实现psudo代码:https://*.com/a/5796394/4279201。

    private static StringBuilder camelCaseToRegular(string i_String)
    {
        StringBuilder output = new StringBuilder();
        int i = 0;
        foreach (char character in i_String)
        {
            if (character <= 'Z' && character >= 'A' && i > 0)
            {
                output.Append(" ");
            }
            output.Append(character);
            i++;
        }
        return output;
    }

#15

To match between non-uppercase and Uppercase Letter Unicode Category : (?<=\P{Lu})(?=\p{Lu})

在非大写字母和大写字母之间进行匹配:(?<=\P{Lu})(?=\ P{Lu})

Dim s = Regex.Replace("CorrectHorseBatteryStaple", "(?<=\P{Lu})(?=\p{Lu})", " ")

#16

Procedural and fast impl:

程序和快速impl:

  /// <summary>
  /// Get the words in a code <paramref name="identifier"/>.
  /// </summary>
  /// <param name="identifier">The code <paramref name="identifier"/></param> to extract words from.
  public static string[] GetWords(this string identifier) {
     Contract.Ensures(Contract.Result<string[]>() != null, "returned array of string is not null but can be empty");
     if (identifier == null) { return new string[0]; }
     if (identifier.Length == 0) { return new string[0]; }

     const int MIN_WORD_LENGTH = 2;  //  Ignore one letter or one digit words

     var length = identifier.Length;
     var list = new List<string>(1 + length/2); // Set capacity, not possible more words since we discard one char words
     var sb = new StringBuilder();
     CharKind cKindCurrent = GetCharKind(identifier[0]); // length is not zero here
     CharKind cKindNext = length == 1 ? CharKind.End : GetCharKind(identifier[1]);

     for (var i = 0; i < length; i++) {
        var c = identifier[i];
        CharKind cKindNextNext = (i >= length - 2) ? CharKind.End : GetCharKind(identifier[i + 2]);

        // Process cKindCurrent
        switch (cKindCurrent) {
           case CharKind.Digit:
           case CharKind.LowerCaseLetter:
              sb.Append(c); // Append digit or lowerCaseLetter to sb
              if (cKindNext == CharKind.UpperCaseLetter) {
                 goto TURN_SB_INTO_WORD; // Finish word if next char is upper
              }
              goto CHAR_PROCESSED;
           case CharKind.Other:
              goto TURN_SB_INTO_WORD;
           default:  // charCurrent is never Start or End
              Debug.Assert(cKindCurrent == CharKind.UpperCaseLetter);
              break;
        }

        // Here cKindCurrent is UpperCaseLetter
        // Append UpperCaseLetter to sb anyway
        sb.Append(c); 

        switch (cKindNext) {
           default:
              goto CHAR_PROCESSED;

           case CharKind.UpperCaseLetter: 
              //  "SimpleHTTPServer"  when we are at 'P' we need to see that NextNext is 'e' to get the word!
              if (cKindNextNext == CharKind.LowerCaseLetter) {
                 goto TURN_SB_INTO_WORD;
              }
              goto CHAR_PROCESSED;

           case CharKind.End:
           case CharKind.Other:
              break; // goto TURN_SB_INTO_WORD;
        }

        //------------------------------------------------

     TURN_SB_INTO_WORD:
        string word = sb.ToString();
        sb.Length = 0;
        if (word.Length >= MIN_WORD_LENGTH) {  
           list.Add(word);
        }

     CHAR_PROCESSED:
        // Shift left for next iteration!
        cKindCurrent = cKindNext;
        cKindNext = cKindNextNext;
     }

     string lastWord = sb.ToString();
     if (lastWord.Length >= MIN_WORD_LENGTH) {
        list.Add(lastWord);
     }
     return list.ToArray();
  }
  private static CharKind GetCharKind(char c) {
     if (char.IsDigit(c)) { return CharKind.Digit; }
     if (char.IsLetter(c)) {
        if (char.IsUpper(c)) { return CharKind.UpperCaseLetter; }
        Debug.Assert(char.IsLower(c));
        return CharKind.LowerCaseLetter;
     }
     return CharKind.Other;
  }
  enum CharKind {
     End, // For end of string
     Digit,
     UpperCaseLetter,
     LowerCaseLetter,
     Other
  }

Tests:

测试:

  [TestCase((string)null, "")]
  [TestCase("", "")]

  // Ignore one letter or one digit words
  [TestCase("A", "")]
  [TestCase("4", "")]
  [TestCase("_", "")]
  [TestCase("Word_m_Field", "Word Field")]
  [TestCase("Word_4_Field", "Word Field")]

  [TestCase("a4", "a4")]
  [TestCase("ABC", "ABC")]
  [TestCase("abc", "abc")]
  [TestCase("AbCd", "Ab Cd")]
  [TestCase("AbcCde", "Abc Cde")]
  [TestCase("ABCCde", "ABC Cde")]

  [TestCase("Abc42Cde", "Abc42 Cde")]
  [TestCase("Abc42cde", "Abc42cde")]
  [TestCase("ABC42Cde", "ABC42 Cde")]
  [TestCase("42ABC", "42 ABC")]
  [TestCase("42abc", "42abc")]

  [TestCase("abc_cde", "abc cde")]
  [TestCase("Abc_Cde", "Abc Cde")]
  [TestCase("_Abc__Cde_", "Abc Cde")]
  [TestCase("ABC_CDE_FGH", "ABC CDE FGH")]
  [TestCase("ABC CDE FGH", "ABC CDE FGH")] // Should not happend (white char) anything that is not a letter/digit/'_' is considered as a separator
  [TestCase("ABC,CDE;FGH", "ABC CDE FGH")] // Should not happend (,;) anything that is not a letter/digit/'_' is considered as a separator
  [TestCase("abc<cde", "abc cde")]
  [TestCase("abc<>cde", "abc cde")]
  [TestCase("abc<D>cde", "abc cde")]  // Ignore one letter or one digit words
  [TestCase("abc<Da>cde", "abc Da cde")]
  [TestCase("abc<cde>", "abc cde")]

  [TestCase("SimpleHTTPServer", "Simple HTTP Server")]
  [TestCase("SimpleHTTPS2erver", "Simple HTTPS2erver")]
  [TestCase("camelCase", "camel Case")]
  [TestCase("m_Field", "Field")]
  [TestCase("mm_Field", "mm Field")]
  public void Test_GetWords(string identifier, string expectedWordsStr) {
     var expectedWords = expectedWordsStr.Split(' ');
     if (identifier == null || identifier.Length <= 1) {
        expectedWords = new string[0];
     }

     var words = identifier.GetWords();
     Assert.IsTrue(words.SequenceEqual(expectedWords));
  }

#1

160