using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"((?:\G(?!\A)|START_TAG)(?:(?!START_TAG|FOO).)*?)FOO(?=.*END_TAG)";
string substitution = @"$1<Replaced>";
string input = @"Text multiline, bla bla bla **FOO** text text text *START_TAG* text text text text **FOO** a lot of texts
**FOO** more text
*END_TAG*";
RegexOptions options = RegexOptions.Singleline;
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