using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?(DEFINE) # Definitions
(?P<tags>user|time|sport|something) # Keys
(?P<value>[^=&]+) # Value
(?P<pair>(?&tags)(?:=(?&value))?) # A pair could have an optional value
(?P<query>(?&pair)(?:&(?&pair))*) # A query is one or more pairs separated with &
)
(?&query) # Match it";
string input = @"Log 1: user=mike&time=now&sport=hockey&something
Log 2: time=now&sport=hockey&user=mike&something
Log 3: sport=hockey&time=now&user=mike&something";
RegexOptions options = RegexOptions.IgnorePatternWhitespace;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx