如何检查命名的捕获组是否存在？

In my regex the pattern is something like this:

在我的正则表达式中，模式是这样的：

@"Something\(\d+, ""(.+)""(, .{1,5}, \d+, (?<somename>\d+)?\),"

So I would like to know if <somename> exists. If it was a normal capture group, I could just check if the capture groups are greater than the number of groups without that/those capture group(s), but I don't have the option here.

所以我想知道 是否存在。如果它是一个普通的捕获组，我可以检查捕获组是否大于没有那个/那些捕获组的组数，但是我没有这里的选项。

Could anyone help me find a way round this? I don't need it to be efficient, it's just for a one-time program that's used for sorting, so I don't mind if it takes a bit to run. It's not going to be for public code.

有人能帮我找到解决方法吗？我不需要它有效率，它只是用于排序的一次性程序，所以我不介意它是否需要运行一点。它不适用于公共代码。

1 个解决方案

#1

According to the documentation:

根据文件：

If groupname is not the name of a capturing group in the collection, or if groupname is the name of a capturing group that has not been matched in the input string, the method returns a Group object whose Group.Success property is false and whose Group.Value property is String.Empty.

如果groupname不是集合中捕获组的名称，或者groupname是输入字符串中未匹配的捕获组的名称，则该方法返回Group对象，其Group.Success属性为false且其Group .Value属性是String.Empty。

var regex = new Regex(@"Something\(\d+, ""(.+)""(, .{1,5}, \d+, (?<somename>\d+)?\),");
var match = regex.Match(input);
var group = match.Groups["somename"];
bool exists = group.Success;