using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?(DEFINE)
(?<string>'[^']++')
(?<int>\b\d+\b)
(?<sp>\s*)
(?<key>\b\w+\b)
(?<value>(?&string)|(?&int))
(?<exp>(?&key) (?&sp) = (?&sp) (?&value))
(?<logic>\b (?:and|or) \b)
(?<main>
(?<token> \( (?&sp) (?&main) (?&sp) \) | (?&exp) )
(?:
(?&sp) (?&logic) (?&sp)
(?&token)
)*
)
)
(?:
^ (?&sp) (?= (?&main) (?&sp) $ )
|
(?!^) \G
(?&sp) (?&logic) (?&sp)
)
(?:
\( (?&sp) (?<m_main>(?&main)) (?&sp) \)
|
(?<m_key>(?&key)) (?&sp) = (?&sp) (?<m_value>(?&value))
)";
string input = @"name = 'benjo' and (surname = 'benny' or surname = 'bennie') or age = 4
or
name = 'benjo' and (surname = 'benny' or surname = 'bennie') or (age = 4 or age = 6)
and
(name = 'benjo' or name='xxx') and (surname = 'benny' or surname = 'bennie') or age = 4";
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