C# 匹配重复模式

我当前正在尝试匹配并捕获以下输入中的文本：

field: one two three field: "moo cow" field: +this

---

我可以将

字段：

与

[a-z]*\：

匹配，但是我似乎无法匹配其余的内容，到目前为止，我的尝试只能捕获我不想做的所有内容。

不要忘记，您实际上可以匹配正则表达式中的文字字符串。如果您的模式是这样的：

field\:

---

您将按字面匹配“field:”，而不匹配任何其他内容。

如果您知道它总是按字面匹配

field:

则绝对不需要正则表达式：

var delimiters = new String[] {"field:"};
string[] values = input.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);

(     # opens a capturing group; the content can later be accessed with Groups[1]
[a-z] # lower-case letter
+     # one or more of them
)     # end of capturing group
:     # a literal colon
(     # opens a capturing group; the content can later be accessed with Groups[2]
(?:   # opens a non-capturing group; just a necessary subpattern which we do not
      # need later any more
(?!   # negative lookahead; this will NOT match if the pattern inside matches
[a-z]+:
      # a word followed by a colon; just the same as we used at the beginning of
      # the regex
)     # end of negative lookahead (not that this does not consume any characters;
      # it LOOKS ahead)
.     # any character (except for line breaks)
)     # end of non-capturing group
*     # 0 or more of those
)     # end of capturing group

---

但是，从您的正则表达式中，我假设name

字段

可以变化，只要它位于冒号前面。您可以尝试捕获一个单词，后跟

：

，然后捕获下一个单词之前的所有内容（使用前瞻）

正则表达式的解释：

var delimiters = new String[] {"field:"};
string[] values = input.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);

(     # opens a capturing group; the content can later be accessed with Groups[1]
[a-z] # lower-case letter
+     # one or more of them
)     # end of capturing group
:     # a literal colon
(     # opens a capturing group; the content can later be accessed with Groups[2]
(?:   # opens a non-capturing group; just a necessary subpattern which we do not
      # need later any more
(?!   # negative lookahead; this will NOT match if the pattern inside matches
[a-z]+:
      # a word followed by a colon; just the same as we used at the beginning of
      # the regex
)     # end of negative lookahead (not that this does not consume any characters;
      # it LOOKS ahead)
.     # any character (except for line breaks)
)     # end of non-capturing group
*     # 0 or more of those
)     # end of capturing group

---

所以首先我们匹配

anylowercaseword:

。然后我们一次匹配一个以上的字符，每一个都检查这个字符不是另一个小写字母的开头：。通过捕获组，我们可以稍后分别找到字段的名称和字段的值。

您需要捕获的确切内容是什么？之后的一切，但不包括

字段：

？答案可能对他有用，我认为新加入regex的人很难理解这一点…@MarioDeSchaepmeester你可能是对的，但我通常会因为提供了简单的答案而被更有经验的用户责骂：D.@MarioDeSchaepmeester补充了一些相当广泛的解释；）看起来不错！连我都明白。你用什么工具写出来并格式化了吗？我看你只用了5分钟，还是你只是一个打字速度快的人？@MarioDeSchaepmeester我想我只是一个打字速度快的人；）。我都是手工做的。