using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?i)\b(drop|keep|where|rename|obs)\s*=\s*(?|(\w+(?:\s+\w+)*)(?=\s+\w+\s+=|$)|\((.*?)\))";
string input = @"drop = blah blah blah something keep = bar foo nlah aaaa rename = (a=b d=e) obs=4 where = (foo > 45 and bar == 35)";
RegexOptions options = RegexOptions.Multiline;
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