using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\d_([a-zA-Z_]+)_[0-9]+_";
string input = @" abc_account2621_activity_20161116_20161117_030627_311999667.csv
abc_account2621_click_2016111606_20161116_221031_311735299.csv
abc_account2621_impression_2016111605_20161116_221808_311685411.csv
abc_account2621_rich_media_2016111606_20161116_192542_311735300.csv
abc_account2621_match_table_actwd342ivity_cats_20161116_20161117_0311_31.csv.gz
abc_account2621_match_table_activity_tdwypes_20161116_20161117_0342_31.csv.gz";
foreach (Match m in Regex.Matches(input, pattern))
{
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