捕获关键词后面的文字 [英] Capture text following the key words

问题描述

string text = "animal: leather, bacon, eagle. vegetable: timber, potato. mineral: granite, gem stones, waterfall.";
MatchCollection matches = Regex.Matches(text, @"(?'1'(animal:)|(mineral:)|(vegetable:).*?)", RegexOptions.ExplicitCapture);

我原以为这个返回3场比赛的代码：



动物：皮革，培根，鹰。，

蔬菜：木材，土豆。，并且

矿物：花岗岩，宝石，瀑布。



相反，返回的三个捕获只是关键字。为什么它没有捕获。*？关注这些关键字？如果我将以下文字贪婪，我只返回一个匹配，这是完整的字符串（正如我所料）。



干杯，



Mick

I was expecting this code to return 3 matches :

"animal: leather, bacon, eagle. ",
"vegetable: timber, potato. ", and
"mineral: granite, gem stones, waterfall."

Instead the three captures returned are the keywords only. Why is it not capturing the ".*?" following those keywords? If I make the following text greedy, I only get the one match returned, which is the full string (as I would expect).

Cheers,

Mick

推荐答案

搞定了。我需要围绕关键字选择添加额外的分组（以及如问题评论中所述的前瞻）。给出预期答案的正则表达式是：



@（？'1'（（动物:)）|（矿物：）| （蔬菜：））。*？（？=（动物:) |（矿物质:) |（蔬菜:) |

Got it. I needed to add additional grouping around the keyword selection (as well as having the look-ahead as described in the comments of the problem). The regex that gives the the expected answer is:

@"(?'1'((animal:)|(mineral:)|(vegetable:)).*?(?=(animal:)|(mineral:)|(vegetable:)|

））



线索是蔬菜：给出了正确的结果 - 它正在做

))

The clue was that the "vegetable:" was giving the correct result - it was doing

(animal:)|(mineral:)|(vegetable:.*?)

而不是

rather than

((animal:)|(mineral:)|(vegetable:)).*?

尝试这是否有效，只需在*之前添加空格？？

Try if this works, Just added space before *?

Regex.Matches(text, @"(?'1'(animal:)|(mineral:)|(vegetable:). *?)"

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