C# Discussion Boards - CodeProject

Re: Regex.Remove

Wheels01210-Jul-09 5:29

Wheels012

10-Jul-09 5:29

Thank you riced.

Any idea on how to rid the string from the (_) underscore?

WHEELS

Re: Regex.Remove

riced10-Jul-09 5:39

riced

10-Jul-09 5:39

Did you try @"[^_\w\.]" ? Note the _ after the ^ Smile | :)

I don't know why the underscore is staying in since AFAIK \w should only compare with letters or digits (but I've not used anything like this in C#).

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Re: Regex.Remove

Wheels01210-Jul-09 5:41

Wheels012

10-Jul-09 5:41

Hi riced.

I read your response too quickly.

I tried

string = Regex.Replace(string, @"[^_\w\.]", "");

but unfortunately it didn't do the trick.

WHEELS

Re: Regex.Remove

riced10-Jul-09 6:07

riced

10-Jul-09 6:07

I think its an Oops on my part the ^_ says don't replace _. Smile | :)

Try @"[^\w\.]|_" - i.e. non-word or _.

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Re: Regex.Remove

Wheels01210-Jul-09 6:11

Wheels012

10-Jul-09 6:11

Hi ricer.

It worked awesome.

Thanks again.

WHEELS

Re: Regex.Remove

riced10-Jul-09 6:16

riced

10-Jul-09 6:16

Fatal mistake in my first reply - failed to engage brain Big Grin | :-D

And the 'negative logic' got by using [^...] always confuses me.

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Re: Regex.Remove

Henry Minute10-Jul-09 5:37

Henry Minute

10-Jul-09 5:37

I cannot help you with the underscore part, but:

\w means any character in a-z, A-Z, 0-9 or _
\. means a literal full-stop as it is escaped
the ^ means Negate

put it all together and you get 'anything that is NOT a character or number, an underscore or a full-stop'.

I have had a thought about the underscore. Since \w includes the underscore, replace it with your own character class that doesn't include the underscore.
Something like @"[^[a-zA-Z0-9]\.]"

WARNING This may not work, as I have only just started on regular expressions.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: Regex.Remove

Wheels01210-Jul-09 5:45

Wheels012

10-Jul-09 5:45

Thank you Henry. That is very helpful. Are you stating that there is no way to configure the parmeter to filter out the underscore?

WHEELS

Re: Regex.Remove

DoctorMick10-Jul-09 6:13

DoctorMick

10-Jul-09 6:13

If you only want letters and/or full stops try the following:

string initial = @"abc_def<>";
string replaced = Regex.Replace(initial, @"[^A-Za-z\.]", "");
MessageBox.Show(replaced);

I guess you might need to amend it to allow spaces etc but at least it gets rid of underscores.

Re: Regex.Remove

Henry Minute10-Jul-09 6:20

Henry Minute

10-Jul-09 6:20

No, I'm saying that I do not know how to do it. I did however modify my post with an attempt to do so. But as I say in the modification it may not work as I am new to regex myself.

Re: Regex.Remove

Henry Minute10-Jul-09 6:57

Henry Minute

10-Jul-09 6:57

If you think you might use regular expressions in other applications, can I commend to you Expresso Regular Expression Development Tool[^]. It's free, and it's good.

Re: Regex.Remove

OriginalGriff10-Jul-09 8:27

OriginalGriff

10-Jul-09 8:27

Thank you very much for that! I can see Regex being seriously usefull, but it looks so APL like that I just shudder and try to look away...

This could realy help! Thumbs Up | :thumbsup:

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This message is made of fully recyclable Zeros and Ones

Re: Regex.Remove

Henry Minute10-Jul-09 10:09

Henry Minute

10-Jul-09 10:09

I never actually used APL, although one place I worked there were some who did. One look at the keyboard was enough to put me off. Big Grin | :-D

Parse Parenthesis Block in String

dataminers10-Jul-09 4:51

dataminers

10-Jul-09 4:51

How can I parse parenthesis block in string?

For example I have formula in string format.

((10+5)*3/(2+1))+7

I want to add stack to following order;

(10+5)
*
3
/
(2+1)
+
7

Thanks...

Re: Parse Parenthesis Block in String

J4amieC10-Jul-09 4:55

J4amieC

10-Jul-09 4:55

What have you tried so far? Do you have some code?

What are you asking here? If you're after somebody to write a parser for you generally you need to pay someone.

Re: Parse Parenthesis Block in String

Henry Minute10-Jul-09 5:00

Henry Minute

10-Jul-09 5:00

You could try taking a look at State of the Art Expression Evaluation[^], one of the many Expression Parsers here on CP. There are loads more on the web.

Have root round till you find one that suits your requirements, or can be easily modified to do so.

Re: Parse Parenthesis Block in String

dataminers10-Jul-09 5:20

dataminers

10-Jul-09 5:20

thanks...

Re: Parse Parenthesis Block in String

harold aptroot10-Jul-09 8:44

harold aptroot

10-Jul-09 8:44

Sounds like you want the Shunting-yard algorithm[^]
You may have to change the "output queue" to "output stack" but that's trivial.

can we create object of partial class

Vivek Vijayan10-Jul-09 4:10

Vivek Vijayan

10-Jul-09 4:10

can we create object of partial class

This code was posted by me...

Re: can we create object of partial class

Mirko198010-Jul-09 4:14

Mirko1980

10-Jul-09 4:14

Yes, for example, the following code works:

public partial class Class1
{
    int i = 10;

    public void Foo()
    {
        Console.WriteLine(i);
    }
}

static class Program
{
    static void Main()
    {
        Class1 cl1 = new Class1();
        cl1.Foo();
    }
}

Re: can we create object of partial class

DoctorMick10-Jul-09 4:26

DoctorMick

10-Jul-09 4:26

Yes but it will create an instance of all parts of the class (if that makes sense) and not just one of the partial implementations.

Re: can we create object of partial class

Thomas Weller10-Jul-09 4:52

Thomas Weller

10-Jul-09 4:52

What exactly do you mean?
The partial keyword means nothing but: the source code for a certain class can be found in more than one ASCII file. It's all about text...

So a partial class is just another class, there is nothing like 'partial' in the IL code that the compiler generates. And of course you can instantiate a normal class...

Regards
Thomas

www.thomas-weller.de

Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
Programmer - an organism that turns coffee into software.

Re: can we create object of partial class

PIEBALDconsult10-Jul-09 6:07

PIEBALDconsult

10-Jul-09 6:07

The partial keyword is just a hint to the compiler. Once the code is compiled, it is no longer partial.

Get the COM port for my cardreader/writer connected through a usb

Member 435374510-Jul-09 3:52

Member 4353745

10-Jul-09 3:52

i m writing a web app to communicate with the card reader/writer.
before communicating i need to set the COM port on which it is connected .
i knw that the system emulates this usb port as a serial port.
i need to knw the COM Port on which the device is connected ,recognize a device is connected / disconnected.i m trying to use Microsoft.Win32 but not getting how to use it actually.
i m new to c# pgming ,any answers will be a great help.
plz provide sample codes if possible.
Thanx in advance.

mukeshmkg

Re: Get the COM port for my cardreader/writer connected through a usb

DoctorMick10-Jul-09 4:28

DoctorMick

10-Jul-09 4:28

If your web app is trying to read data from the users usb connection it can't be done using ASP. If you're trying to read data from a card reader connected to the server then people will be able to help but can you clarify if you are trying to use a card reader on the server or the client?

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