using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?s)(?:START).*?(?:END)(?-s)|//.+|\. old|^\s+old(*SKIP)(*FAIL)|\b(old)\b";
string input = @"xx START xx old xx END xx --> ignore
xx old xx --> REPLACE !
START xx old --> ignore
xx old xx END --> ignore
xx old xx --> REPLACE !
// xx old --> ignore
xx // xx old --> ignore
xx . old old xx --> ignore first one, replace second one
.
old --> ignore
(old) xx --> REPLACE !
xx old xx --> REPLACE !";
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