Question

我需要根据连接的单词在数组中拆分几个字符串，即on，in，from等。

string sampleString = "what was total sales for pencils from Japan in 1999";

期望的结果：

what was total sales

for pencils

from japan 

in 1999

我熟悉基于一个单词而不是多个单词分割字符串：

string[] stringArray = sampleString.Split(new string[] {"of"}, StringSplitOptions.None);

有什么建议吗？

Answer 1

对于此特定方案，您可以使用正则表达式执行此操作。

你必须使用一种称为超前模式的东西，否则你将会从结果中删除你要拆分的单词。

这是一个小型LINQPad程序，用于演示：

void Main()
{
    string sampleString = "what was total sales for pencils from Japan in 1999";
    Regex.Split(sampleString, @"\b(?=of|for|in|from)\b").Dump();
}

输出：

what was total sales  
for pencils  
from Japan  
in 1999

但是，正如我在评论中所说，它会被包含你所分割的任何单词的地方名称所绊倒，所以：

string sampleString = "what was total sales for pencils from the Isle of Islay in 1999";
Regex.Split(sampleString, @"\b(?=of|for|in|from)\b").Dump();

输出：

what was total sales  
for pencils  
from the Isle  
of Islay  
in 1999

正则表达式可以像这样重写，以便在将来的维护中更具表现力：

Regex.Split(sampleString, @"
    \b          # Must be a word boundary here
                # makes sure we don't match words that contain the split words, like 'fortune'
    (?=         # lookahead group, will match, but not be consumed/zero length
        of      # List of words, separated by the OR operator, |
        |for
        |in
        |from
    )
    \b          # Also a word boundary", RegexOptions.IgnorePatternWhitespace).Dump();

您可能还想在选项中添加RegexOptions.IgnoreCase，以匹配＆＃34; Of＆＃34;和＆＃34; OF＆＃34;等。

在连接词上分裂字符串

1 个答案: