请问关于c的具体应用场景有哪些？

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该代码片段使用了一个键/值对的紧凑模式字符串，其中键是名称，值是单个小写字母。以下是对该代码的简化

python定义紧凑模式字符串text=name:abc name:def name:ghi name:jkl

分割字符串并提取值values=text.split(name:)[-1].split( )

输出结果print(, .join(values))

输出结果为：abc, def, ghi, jkl

具有键/值对的“紧密”重复模式的字符串(对于此示例,键是“名称”,值应该是单个小写字)

string text = "name: abc name: def name: ghi name: jkl";

应该转换为输出

abc, def, ghi, jkl,

而在模式中的任何干扰(“非紧”所以说)

string text = "name: abc x name: def name: ghi name: jkl";

应该导致比赛失败,这有点像

abc, ## Exception occurred: x cannot be matched to the pattern ##

我试过了

string text = "name: abc name: def name: ghi name: jkl"; string pattern = @"name:\s*([a-z])*\s*"; MatchCollection ms = Regex.Matches(text, pattern); foreach (Match m in ms) { Console.Write(m.Groups[1].Value+", "); }

但它回来了

c, f, i, l,

是什么导致了这种奇怪的行为,我该如何解决？

与大多数其他正则表达式不同,C#(.Net)的引擎实际上通过Group类的 Captures属性跟踪重复捕获.

Group.Captures Property

Gets a collection of all the captures matched by the capturing group, in innermost-leftmost-first order (or innermost-rightmost-first order if the regular expression is modified with the 07001 option).

这意味着通过访问Groups [1](如下面的代码所示)然后访问Captures属性,我们有效地获取每个重复捕获的值在我们的字符串上.

码

See code in use here

using System; using System.Linq; using System.Text.RegularExpressions; class Example { static void Main() { string[] strings = new string[]{ "name: abc name: def name: ghi name: jkl", "name: abc x name: def name: ghi name: jkl" }; Regex regex = new Regex(@"^(?:name: *([a-z]+) *)+$"); foreach(string s in strings) { if(regex.IsMatch(s)) { Match match = regex.Match(s); Console.WriteLine(string.Join(", ", from Capture c in match.Groups[1].Captures select c.Value)); } else { Console.WriteLine("Invalid input"); } } } }

结果

name: abc name: def name: ghi name: jkl # abc, def, ghi, jkl name: abc x name: def name: ghi name: jkl # Invalid input