正则表达式按非字母数字字符拆分，并对带撇号缩写的单词进行特殊处理

Question

我正在尝试在 C# 中使用正则表达式分割字符串。我想根据所有非字母数字字符将其拆分，但当包含缩写时，我想将带撇号的单词视为整个单词，例如：

'd

、

's

、

't

。
一个例子应该可以阐明我想要实现的目标。给定一个句子，例如：

"Steve's dog is mine 'not yours' I know you'd like'it"

我想获得以下代币：

steve's, dog, is, mine, not, yours, i, know, you'd, like, it

目前我正在使用：

Regex.Split(str.ToLower(), @"[^a-zA-Z0-9_']").Where(s => s != String.Empty).ToArray<string>();

它返回：

steve's , dog , is , mine , 'not , yours', i , know, you'd, like'it

Answer 1

这是一个半正则表达式半LINQ解决方案：

string s = "Steve's dog is mine 'not yours' I know you'd like'it";
string[] result = Regex.Matches(s, "\\w+('(s|d|t|ve|m))?")
    .Cast<Match>().Select(x => x.Value).ToArray();

我尝试匹配您想要获取的所有内容，而不是您想要分割的分隔符。然后我只是

Select

编辑了

Value

并将它们全部变成一个数组。

Answer 2

\w+(?:'(?![aeiou])\w+)?

\w+         // 1 or more word chars
(?:         // optional uncaptured group
'           // apostrophe
(?![aeiou]) // look ahead and assert the character class doesn't match
\w+         // 1 or more word chars
)?          // end of optional group

• 渔获：

  should've

  、

  i'm

  、

  'tis

• 没听懂：

  rock 'n' roll

演示

Answer 3

我能想到的解决方案是这样的：

var txt = "Steve's dog is mine 'not yours' I know you'd like'it, the Hundred Years' War, I'm - they're - don't - o'clock - we've 'the Hundred Years' War of yours'";

// Finding valid `'`s and replace them temporarily to something like `_replaceMe_`
// Then replace net `'` to a blank space ` `
var osTxt = Regex.Replace(txt.ToLower(), 
    @"(?<=[^a-z]i)'(?=m[^a-z])|(?<=[a-z])'(?=([rv]e|[ds])[^a-z])|(?<=[a-z]n)'(?=t[^a-z])|(?<=[^a-z]o)'(?=(clock)?[^a-z])", 
    "_replaceMe_")
    .Replace("\'"," ");

// Now, extract words from sentence and replace `_replaceMe_` back to `'`
var words = Regex.Matches(osTxt, @"\w+")
    .OfType<Match>()
    .Select(c=> c.Value.Replace("_replaceMe_", "\'"))
    .ToList();

但这在像

'

这样的句子中不会有

Years'

的

the Hundred Years' War

。
还有一些其他有效的情况被忽略;)。

Answer 4

 //  also covers: I've I'm She'll you're you've";

        var sen = "Steve's dog is mine 'not yours' I know you'd like'it";

        StringBuilder builder = new StringBuilder();

        foreach (Match m in Regex.Matches(sen, @"[^' ]+\w+\'([dstm]|ll|ve|re)|\w+"))
        {
            builder.Append(m.Value).Append(",");
        }

        Console.WriteLine(builder);

        //Steve's,dog,is,mine,not,yours,I,know,you'd,like,it,

Answer 5

我就是这样做的：

string phrase = "Steve's dog is mine 'not yours' I know you'd like'it";
var splittedString = Regex.Split(phrase, "[^a-zA-Z0-9']+")
    .Select(word => word.Trim('\''))
    .Where(word => word
        .Any())
    .ToArray();