using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(.*?)(ND_\d_)(Dist_\d_)(.*)";
string substitution = @"$1$3$2$4";
string input = @"Par1_MD_0_5_AL_2_ND_4_Dist_0_Pot_Drop_out.txt
Par1_MD_0_5_AL_2_ND_4_Dist_1_Pot_Drop_out.txt
Par1_MD_0_5_AL_2_ND_6_Dist_2_Pot_Drop_out.txt
Par1_MD_0_5_AL_2_ND_8_Dist_3_Pot_Drop_out.txt
";
RegexOptions options = RegexOptions.Multiline;
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