Regular Expression for Exact Extension for a Filename

sampath meka

11y1.1kVisual Basic .NET

Hello All,

My question is i have following file names where it process based on the extension type using regular expression only.

myname.c

myname.csi

myname.ctr

myname.hsi

myname.h

myname.htr

For the above strings if we apply regular expression the output should be

myname.c

myname.h

I want only file name with extension .c and .h only

Thanks & Regards,

Sampath

5 Replies

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sampath meka11y ago
The solution provided will not work in vbs please provide me alternate
0
Wim Sturkenboom11y ago
[quote]
Sorry with your expression the code is not executing if i remove $ at end it is working but considering .csi,.ctr has output
[/quote]

Seems to work on my system (with $ included).

A little test program in C# (sorry, don't do VB)

static void Main(string[] args)
{
    Regex re = new Regex("^.+[.][ch]$");
    string[] filenames = new string[] {
        "myname.c",
        "myname.csi",
        "myname.ctr",
        "myname.hsi",
        "myname.h",
        "myname.htr"
    };

    for (int cnt = 0; cnt < filenames.Length; cnt++)
    {
        if (re.IsMatch(filenames[cnt]))
        {
            Console.WriteLine("* " + filenames[cnt]);
        }
        else
        {
            Console.WriteLine(" " + filenames[cnt]);
        }
    }

    Console.ReadLine();
}

Result (matching files are prepended with '*')

* myname.c
myname.csi
myname.ctr
myname.hsi
* myname.h
myname.htr

+1
sampath meka11y ago
Sorry with your expression the code is not executing if i remove $ at end it is working but considering .csi,.ctr has output
0
sampath meka11y ago
I tried this expression objRegEx.Pattern ="\w+\.(?:|h|c)" for which the output would be all .h filenames and .c containing filenames all came has output. I tried your expression the output is same as above which is incorrect has i am expecting exactly .c and .h filename
0
Wim Sturkenboom11y ago
What have you tried yourself?

Some like below should do the trick

^.+[.][ch]$

^ beginning of text
.+ anything, at least 1 character
[.] followed by dot
[ch] followed by c or h
$ end of text

[ch]$ can be read as c or h at end of text
0