using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?(DEFINE)
(?# var )
(?<var>[a-zA-Z_\x7f-\xff][\w\x7f-\xff]*)
(?# val )
(?<val>(?&call)|(?&str)|(?&num)|(?&bool))
(?<call>\$\{CALL\s+[a-zA-Z_\x7f-\xff][\w\x7f-\xff]*\s*\})
(?<str>""[^""]*""|'[^']*')
(?<num>\d+)
(?<bool>(?i)(?:false|true)(?-i))
)
((?(?=no(?8)\S)no|yes))
(\${(?P<type>VAR)\s+((?&var))\s*\=\s*((?&val))\s*\})(\S)?";
string input = @"
${VAR foo=""What""}x
${VAR foo=""What""}
yes${VAR foo=""What""}
no${VAR foo=""What""}x
";
RegexOptions options = RegexOptions.Singleline | 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