Clash Royale CLAN TAG

Regex pattern matching C#

[Here is the picture]1I want to loop through each file in a folder and save the substring of the file name to a variable.

For example lets say I have the following file in a folder:

ERISRequest_INC1234567.csv //Should Print -> INC1234567

ERISRequest_INC8901234.csv //Should print -> INC8901234

fileName.csv //should skip this one

I want to extract the shown substring if and only if the file name starts with ERISRequest_ and store it in a variable

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FileName
{
class Program
{
static void Main(string args)
{
DirectoryInfo di = new DirectoryInfo(@"C:");
foreach(FileInfo fi in di.GetFiles())
{
Console.WriteLine(fi.Name);

}
Console.ReadLine();
}
}
}


if (Path.GetFileNameWithoutExtension(fi.Name).StartsWith("ERISRequest_")) {...}

1 Answer
1

It helps you. Is that what you're looking for?

var regstr = $"^ERISRequest_.*?";

DirectoryInfo di = new DirectoryInfo(@"C:");
foreach (FileInfo fi in di.GetFiles())
{
string name = Path.GetFileNameWithoutExtension(fi.Name);
if (Regex.IsMatch(name, regstr))
{
Console.WriteLine(name.Replace("ERISRequest_", ""));
}
}


An example for that;

var regstr = $"^ERISRequest_.*?";

var result = Regex.IsMatch("ERISRequest_.", regstr); // true
var result2 = Regex.IsMatch("ERISRequest", regstr); // false
var result3 = Regex.IsMatch("aERISRequest_", regstr); // false
var result4 = Regex.IsMatch("ERISRequest_asd", regstr); // true


regstr

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.