[英]Recursive regex: Unrecognized grouping construct
我编写了一个正则表达式来解析BibTex条目,但我认为我使用了.net中不允许的东西,因为我得到了一个Unrecognized grouping construct
异常。
谁能发现我的错误?
(?<entry>@(\w+)\{(\w+),(?<kvp>\W*([a-zA-Z]+) = \{(.+)\},)(?&kvp)*(\W*([a-zA-Z]+) = \{(.+)\})\W*\},?\s*)(?&entry)*
这就是我如何捕获您提供的字符串中的所有细节:
@(?<type>\w+)\{(?<name>\w+),(?<kvps>\s*(?<attribute>\w+)\s*=\s*\{(?<value>.*?)},?\r?\n)+}
见演示
这个正则表达式运行良好,因为C#正则表达式引擎将所有捕获的文本保存在堆栈中,并且可以通过Groups [“name”]访问它。捕获属性。
C#代码显示了如何使用它:
var pattern = @"@(?<type>\w+)\{(?<name>\w+),(?<kvps>\s*(?<attribute>\w+)\s*=\s*\{(?<value>.*?)},?\r?\n)+}";
var matches = Regex.Matches(line, pattern);
var cnt = 1;
foreach (Match m in matches)
{
Console.WriteLine(string.Format("\nMatch {0}", cnt));
Console.WriteLine(m.Groups["type"].Value);
Console.WriteLine(m.Groups["name"].Value);
for (int i = 0; i < m.Groups["attribute"].Captures.Count; i++)
{
Console.WriteLine(string.Format("{0} - {1}",
m.Groups["attribute"].Captures[i].Value,
m.Groups["value"].Captures[i].Value));
}
cnt++;
}
输出:
Match 1
article
Gettys90
author - Jim Gettys and Phil Karlton and Scott McGregor
abstract - A technical overview of the X11 functionality. This is an update of the X10 TOG paper by Scheifler \& Gettys.
journal - Software Practice and Experience
volume - 20
number - S2
title - The {X} Window System, Version 11
year - 1990
Match 2
article
Gettys90
author - Jim Gettys and Phil Karlton and Scott McGregor
abstract - A technical overview of the X11 functionality. This is an update of the X10 TOG paper by Scheifler \& Gettys.
journal - Software Practice and Experience
volume - 20
number - S2
title - The {X} Window System, Version 11
year - 1990
Match 3
article
Gettys90
author - Jim Gettys and Phil Karlton and Scott McGregor
abstract - A technical overview of the X11 functionality. This is an update of the X10 TOG paper by Scheifler \& Gettys.
journal - Software Practice and Experience
volume - 20
number - S2
title - The {X} Window System, Version 11
year - 1990
我假设您的命名反向引用是错误的。 请参阅MSDN。 试试以下
(?<entry>@(\w+)\{(\w+),(?<kvp>\W*([a-zA-Z]+) = \{(.+)\},)\k<kvp>*(\W*([a-zA-Z]+) = \{(.+)\})\W*\},?\s*)\k<entry>*
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