using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @" (?(DEFINE)
(?<old> old [ ] string ) # (1)
)
(?|
( > ) # (2)
(?&old)
( < ) # (3)
|
( "" ) # (2)
(?&old)
( "" ) # (3)
|
( ' ) # (2)
(?&old)
( ' ) # (3)
|
( \( ) # (2)
(?&old)
( \) ) # (3)
)
";
string substitution = @"$2new string$3";
string input = @"(old string) 'old string' old string >old string<
""old string"" >old string< old string 'old string'
";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
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