Web Forms :: Regular Expression That Validates Empty Strings

Oct 16, 2010

I'm trying to write a regular expression that allows positive & negative floating point numbers, but doesn't allow empty strings and characters.I have managed to create this

[Code]....

but it allows empty strings and I can't figure out how to add [+-].

My program is a web app which asks the user to input a temperature.

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Web Forms :: Regular Expression For Empty Textbox?

Jun 16, 2010

I have a problem with regular expression because I want to validate a textbox and I want that mark the error text when the textbox be empty.

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Web Forms :: Regular Expression For Empty TextBox

Nov 20, 2010

I am using regex for server side validations.

I am facing a problem with regex. I want to check for sepecial characters like ><*&()%$@!~+...

I need to filter these special charecters...but the problem is in my 10 textboxes there only 3 are required...

I can submit the form without entering anything...but my regex is not allowing me to submit the form without giving a space from keyboard...

I just want to check for special charecters and empty textbox without giving a spacebar...

I just check these sites(http://regexlib.com/ and http://www.regular-expressions.info/) and read some documentation on regex...its kind of confusing....

Here is my regex for Middlename: ^[a-zA-Z''-'s]|[ ]{1,40}$ its worked but its not correct....then I changed it to ^[a-zA-Z''-'sd*]{1,40}$ this also not taking emptytextbox without giving a space...

My Goal:

In most of the textboxes I need to allow only numbers and - # _ in some textboxes....

For Address: need to allow alphabets and numbers and #-_' "

City: numbers and alphabets no special chars...

Main problem is I can write regex for most of these stuff but need to all textboxes without entering anything (empty textboxes).My work got stoped due to this.

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Web Forms :: Validate Empty Textbox With Regular Expression

Jun 16, 2010

I want That validate the textbox so this no be empty I put that

"[ws]{1,50}"

But I want that the error mark when the textbox be empty.

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Regular Expression Validator Does Not Validate Empty Textbox?

Jun 30, 2010

I would like to validate the textbox for specific text and it must not be blank. But the regular expression validator is not validating if the text box is BLANK. However, it validates if I type something in the text box.

How can I make regular expression to trigger even if the text box is empty?

Should I use Required Validator + Regex Validator at the same time?

<asp:TextBox ID="txtcard" runat="server" MaxLength="16"></asp:TextBox>
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server"
ControlToValidate="txtcard" ErrorMessage="Please type credit card no"
ValidationExpression="^d{16}$"></asp:RegularExpressionValidator>

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Web Forms :: Looking For Regex That Validates 4-digits And Empty Value?

Jun 18, 2010

I can validate textbox field by RegularExpressionValidator with regex "^([0-9]{3,3})$". For the required field validation I put requiredfieldvalidator. Thus, I have two validation controls.

Can I combine them into a sigle RegularExpressionValidator? Then what does regex look like? How can I validate empty fields with RegularExpressionValidator?

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Regular Expression / Input String Is Valid Based On The Given Regular Expression?

Sep 20, 2010

i have to check if an input string is valid based on the given regular expression.. this is the regular expression.

(a(bb+aaa+((ab)*bb+(aba)*aa)(a+b)*) + (b(aa+bbb+((ba)*aa+(bab)*bb)(a+b)*)

+ is an OR

* is a LOOP, it is optional, it may be done as many as a user wants.

i've tried many ways to solve the problem that my professor gave me but my knowledge isn't that enough to solve this problem..

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Internet E-mail Validation Expression Validates Everything?

Mar 21, 2011

I'm validating input in a asp.net page but the problem is it validates e-mails like hasangürsoy@şşıı.com

My code is:

if (Regex.IsMatch(email, @"w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*"))
{ valid }
else { invalid }

EDIT: I've written a question before especially to validate e-mail addresses including Turkish characters but now I don't want users to be able to input mails with Turkish characters because users mostly type Turkish characters by mistake and I cannot send mails to these addresses.

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Web Forms :: Regular Expression Validator / Add Wording To Current Expression:  W+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*?

Feb 16, 2010

I'm trying to use the validator to work on a email form to ensure that they enter a valid from email address. That part works. I also want to add to the expression the text that I pre-populate in the txtbox ("Enter your email address") so on postback, after sending the message, I can clear the fields and repopulate that box.

How do I add that wording to the current expression: w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*

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Web Forms :: Validation Expression For Regular Expression Validator?

Feb 2, 2011

I am using Regular Expression validator for a text box. The below is working fine.It is not performing validation when I enter values like 0000..001.How can I modify validation expression? But it would allow values like 100,...5000 i.e zeros after a number.

<asp:RegularExpressionValidator ID="reg2" runat="server" ControlToValidate="rng2"
ValidationExpression="^[0-9]+" ErrorMessage="*Please Enter a Valid Number for Second Range."
ForeColor="Red" Font-Bold="True"></asp:RegularExpressionValidator>

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Regex - Regular Expression And Validation Expression ?

Dec 1, 2010

I need some help in regular expression.I am validating the textbox text when updating the records.When i click the update button,the first 5 letters should be equal to CM000 or cm000.How to validate this using regular expression in asp.net. does anyone know validationexpression for this.

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Web Forms :: Regular Expression [a-zA-Z0-9()',.-]+[ ]?[a-zA-Z0-9()',.-]*?

Mar 17, 2011

If i am giving the text

hjghj bvgfh . it is failing

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Web Forms :: How To Add Validation So It Doesn't Accept Empty Strings Or Numbers

Jan 6, 2010

i am using a search box for my application which returns a dataset. however when i click on the search button it returns an empty table result. how could i add validation so it doesnt accept empty strings or numbers.

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Web Forms :: Regular Expression For Negation?

Sep 30, 2010

I am a new to regular expressions.I need to validate an identification number so that the textbox doesn't accept numbers like 1111111, 2222222, 3333333......9999999 and 1234567, 2345678, 3456789.Could someone please post regular expression for not accepting such format.

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Web Forms :: Add DOT (.) In The Regular Expression Validation

Jan 5, 2011

I have a Regular Expression ^[a-zA-Z''-'s]{1,40}$ Now i want to allow DOT (.) in this expression so hows its possible to add DOT in this expression.

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Web Forms :: Regular Expression Validation?

Oct 26, 2010

I have a regular expression validation set on text box. I have a grid on the same page with edit and delete buttons. In some cases I don't want the regular expression to fire. For example, I have a scenario where the text box will be disabled but I can still enter data in to the grid and modify it, but the regular expression fires when I modify the grid and the changes in the grid are not processed.how can I stop the validation when I am working on grid. I can see a property causes validation for button to stop validation but don't know how can I stop for the grid.

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Web Forms :: Regarding Regular Expression & Replace?

Mar 23, 2010

i want to find and replace img src path by regular expression.suppose i have the below html and from there i want to replace file path of all the src attribute of image tag.

<P>Hello</P>
<P> </P>
<P><IMG alt="C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\Sunset.jpg" src="C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\Sunset.jpg"></P>

here the file path is src="C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\Sunset.jpg"

and i want to replace it with path like src="www.mysite.com/images/a.gif" with regular expression.how can i do it with regular expression.

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Web Forms :: Regular Expression For URL Validation?

Apr 22, 2010

I am facing a problem for doing URL validation which should allow atlest two periods in the URL.If the URL does not contain atleast two periods then it should throw an error. Also the regular expression must obey all the URL validations.Please help GURUS it is urgent for me to get some solution.

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Web Forms :: Regular Expression For Number?

Feb 1, 2010

I want regular expression for number,i want it for quantity.

it should not except only 0 .becuase 0 quantity is not possible.

but it should work for 10,100,200 etc

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Web Forms :: Regular Expression For P.O. Box Validation?

Apr 25, 2010

I would like to validate P.O. Box with regular expression in web form text box? I don't want to allow user to enter PO Box.

eg. P. O. Box, p.o. box, PO Box, po box, etc

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Jan 21, 2010

I want to rewrite this Url www.xyz.com/products.aspx?id=1&product=acid for this i want regular expression.

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Web Forms :: Code The Regular Expression?

Feb 1, 2011

how to code the following regular expression

ABC[1 digit Number b/w 1-4]1A[7 digit number 0-9]-5[5 digit character]

Eg

ABC21A0123789-5ABCYZ

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Web Forms :: Regular Expression To Match In HTML?

Aug 22, 2010

Here is the kind of text I want to match via a regular Expression

The id="dgSchedule" is always present in the TAG but its location may differ

The table is span over multiple line/contains white spaces/tabs...

I have the regular expression to match the start and end tag respectively over a single line

[Code]....

Is there any regular expression generator available that can generate me a regular expression based on the text I select and the parameters I specify?

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Web Forms :: Finding Regular Expression To Match...

Feb 10, 2010

can someone tell me the regex pettern to match a string from [a-zA-Z] where each character in the group cannot occur more than n number of times.

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Web Forms :: Regular Expression Validator Not Working?

Feb 16, 2010

here is waht i am trying to achieve.

first character is in caps and the rest of the name is in small for Firstname Space
first character is in caps and the rest of the name is in small for lastname

ex: Ajay Kumar Bakshi

expression: ^[A-Z]{1}[a-z]*[s]{1}[A-Z]{1}[a-z]*$

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