using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"MATCH\s*\(\K\s*COALESCE\s*\(\s*([^,)]+)(?:,[^)]*)?\)(?=\)\s*AGAINST)";
string substitution = @"$1";
string input = @"WHERE MATCH (COALESCE(f1, f2, f3)) AGAINST (?) > 0
WHERE MATCH (COALESCE(f1)) AGAINST (?) > 0";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnoreCase;
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