using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"([a-z]+)(\.)(?:(\d+)(.*))?";
string substitution = @"$1 $3";
string input = @"one.2021.spurious.other.information.true
one.two.2022.spurious.other.information.true
one.two.three.2023.spurious.other.information.true
one.two.three.four.2024.spurious.other.information.true
one.two.three.four.five.2025.spurious.other.information.true ";
RegexOptions options = RegexOptions.IgnoreCase | 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