在正则表达式中，如何在每个单词之间添加一个额外的空格？

Question

我有一句话说

"This is my new program"

我想将其转换为

"This  is  my  new  program"

ie，每个单词后面有额外的空格。

如何使用 .net 中的正则表达式实现此目的？

这必须是通用的。例如，如果单词之间的空格数为 4，则应将其变为 5。

Answer 1

string newString = Regex.Replace(originalString, @"\s+", " $0");

Answer 2

为什么使用正则表达式？为什么不对字符串本身使用 Replace 方法？

Answer 3

你可以用这个。尽管我认为如果您没有其他想要保持不变的空间，@LukeH 解决方案会更好。

resultString = Regex.Replace(subjectString, @"(\b\w+\b)(?!$)", "$1 ");

说明：

"
(        # Match the regular expression below and capture its match into backreference number 1
   \b       # Assert position at a word boundary
   \w       # Match a single character that is a “word character” (letters, digits, etc.)
      +        # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
   \b       # Assert position at a word boundary
)
(?!      # Assert that it is impossible to match the regex below starting at this position (negative lookahead)
   $        # Assert position at the end of the string (or before the line break at the end of the string, if any)
)
"

Answer 4

yourString = Regex.Replace(yourString, "\ {1}", "  ")

这会将单个（且仅单个）空间的每个实例替换为两个空格。