csharp regex display matched pattern from text file

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Can someone help me with Regex in csharp...
What I"m trying to do is displaying all lines containing a pattern from a text file,
after reading a lot of tuto and using tools like Regex Tester etc... nothing is working.
- File_Info.txt is the target file containing lines with word "01234567_TRYN_YZ"
- example of line to be displayed: 05/23/12 19:31:20: dsetup32\01234567_TRYN_YZ.txt stop to do...
Thanks in advance.

This is my code:

string[] lines = File.ReadAllLines("File_Info.txt");
Regex regex = new Regex("^[0-9]+.[T]\w{3}.[Y]\w{1}$");
foreach (string line in lines)
{
Match match = regex.Match(line.Trim())
if (match.Successful)
{
Console.WriteLine(Line);
}
}

Posted 30-Oct-12 0:17am

User 9280201

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MT_ · Accepted Answer · 2012-10-30T00:27:00

Solution 1

Hi,

I have modified the code a bit and its working

C#

string[] lines = File.ReadAllLines("d:\\milind.txt");
Regex regex = new Regex(@"\d{8}_TRYN_YZ");
foreach (string line in lines)
{
    Match match = regex.Match(line.Trim());
    if (match.Success)
    {
        Console.WriteLine(line);
    }
}

I have used following data in the file.

05/23/12 19:31:21: dsetup32\01234567_TRYN_YZ.txt
05/23/12 19:31:22: dsetup32\_TRYN_YZ.txt
05/23/12 19:31:23: dsetup32\01234567__YZ.txt
05/23/12 19:31:24: dsetup32\01234533_TRYN_YZ.txt
05/23/12 19:31:25: dsetup32\01234544_TRYN_YZ.txt

And it displayed result correctly as

05/23/12 19:31:21: dsetup32\01234567_TRYN_YZ.txt
05/23/12 19:31:24: dsetup32\01234533_TRYN_YZ.txt
05/23/12 19:31:25: dsetup32\01234544_TRYN_YZ.txt

Hope that helps.

Milind

Posted 30-Oct-12 0:27am

MT_

Updated 30-Oct-12 7:22am

v3

Comments

[no name] 30-Oct-12 7:09am

Dear Milind Thakkar,
thank you so much for your prompt reply.
I have tried your modified code and it is working. However the code displays only one line : 05/23/12 19:31:20: dsetup32\01234567_TRYN_YZ.txt stop to do...
Appuyez sur une touche pour continuer...
The line containing "01234567", what about the others with others digits?
Thanks again.

MT_ 30-Oct-12 7:14am

Hi, Yes, the code is suppose to find entries where it finds exact match "01234567_TRYN_YZ". From your response, I understand, you have a pattern that you are looking. Can you describe the pattern? like
1. First 8 numberic
2. Then underscore (_)
3. Then three alphabet (or exact word TRN)
and so on.
Then I /someone will be able to give correct regex pattern.
Milind

[no name] 30-Oct-12 12:12pm

Dear,
the pattern match I'm looking for is "\01234567_TRYN_YZ"
where only numbers after the backslash change.
the word "_TRYN_YZ" does not change.

Thank you very much.
Wajim

MT_ 30-Oct-12 13:21pm

I think a minor change in the regex will do the trick. Use Regex regex = new Regex(@"\d{8}_TRYN_YZ"); Also updated the solution.

[no name] 30-Oct-12 14:50pm

Dear Milind Thakkar,
you're right, it works by changing the regex as you suggest.
Many thanks.

Wajim

MT_ 31-Oct-12 0:39am

Glad it helped. Do mark it as answer/upvote. - Milind