如何提取从.NET正则表达式的子串? [英] How to extract a substring from a .NET RegEx?
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问题描述
我有一个包含一个(或多个)键/值对的XML文件。对于每一个这些对我要提取的值中的哪一个两个字节的十六进制值。
I have an XML file containing one (or more) key/value pairs. For each of these pairs I want to extract the value which is a two-byte hex value.
所以XML包含这段代码:
So the XML contains this snippet:
<key>LibID</key><val>A67A</val>
其中我可以用下面的前pression,用括号中的ID相匹配。
Which I can match using the following expression, with the ID in parenthesis.
Match match = Regex.Match(content, @"<key>LibID</key><val>([a-fA-F0-9]{4})</val>");
if (match.Success)
{
Console.WriteLine("Found Match for {0}\n", match.Value);
Console.WriteLine("ID was {0}\n", "Help me SO!");
}
我如何可以改变的最后一部分,因此从比赛返回ID?
How can I change the last part so it returns the ID from the match?
干杯!
推荐答案
我想你想
match.Groups[1].Value
(如Dillie-O指出,在评论中,这是第1组,因为组0总是整场比赛。)
(As Dillie-O points out in the comments, it's group 1 because group 0 is always the whole match.)
短,但完整的测试方案:
Short but complete test program:
using System;
using System.Text.RegularExpressions;
class Program
{
static void Main()
{
Regex regex = new Regex("<key>LibID</key><val>([a-fA-F0-9]{4})</val>");
Match match = regex.Match("Before<key>LibID</key><val>A67A</val>After");
if (match.Success)
{
Console.WriteLine("Found Match for {0}", match.Value);
Console.WriteLine("ID was {0}", match.Groups[1].Value);
}
}
}
输出:
Found Match for <key>LibID</key><val>A67A</val>
ID was A67A
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