Solved

Regular expression for Asp.net text box conrol

Posted on 2010-11-22
8
591 Views
Last Modified: 2012-05-10

I have a text box control and I need to restrict the text box input to no more than 255 characters. I created
a regular expression, however it is not correct. Can someone help me out? Here is my validation expression:
validationexpression="^.{0,255}$">


My actual Asp.net code looks something like, this but I know that the regular expression is not correct.

<ASP:RegularExpressionValidator id="regValInstructions" runat="server"
controltovalidate="txtMessage" textmode="multiline" tabindex="43"></ASP:TextBox>



validationexpression="^.{0,255}$">
<ASP:RegularExpressionValidator>
0
Comment
Question by:brgdotnet
  • 2
  • 2
  • 2
  • +1
8 Comments
 
LVL 35

Accepted Solution

by:
Terry Woods earned 200 total points
ID: 34193754
The expression looks fine to me... shouldn't the code look like this though? (or was it just copying and pasting that jumbled it up?)

Try:
validationexpression="^[\s\S]{0,255}$">
0
 
LVL 35

Expert Comment

by:Terry Woods
ID: 34193756
Sorry... ignore the 1st line of my above comment. I meant to erase that and just suggest the pattern.
0
 
LVL 20

Expert Comment

by:informaniac
ID: 34193913
Why not use the MaxLength=255 property of textbox
0
Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

 
LVL 20

Expert Comment

by:informaniac
ID: 34193917
Sry. missed out the multine thing..
0
 
LVL 29

Expert Comment

by:Kumaraswamy R
ID: 34194014
<asp:RegularExpressionValidator ID="txtConclusionValidator1" ControlToValidate="textBox" Text="Exceeding 255 characters" ValidationExpression="^[\s\S]{0,255}$" runat="server" />
0
 
LVL 29

Assisted Solution

by:Kumaraswamy R
Kumaraswamy R earned 40 total points
ID: 34194025
ASP.NET TextBox.MultiLine maxlength
-----------------------------------
Add following javascript

function Count(text,long)
 
{
var maxlength = new Number(long); // Change number to your max length.
if(document.getElementById('<%=TXTCount.ClientID%>').value.length > maxlength){
   text.value = text.value.substring(0,maxlength);
   alert(" Only " + long + " chars");
}
 


Where “textBox” is the asp text box ID.
Also add following events in your textbox.

onKeyUp="javascript:Count(this,200);" onChange="javascript:Count(this,200);"

Your textbox code should look like

 

<asp:TextBox ID="TXTCount" onKeyUp="javascript:Count(this,2);" onChange="javascript:Count(this,2);"  TextMode=MultiLine Columns="5" Rows="5" runat=server />
   
0
 
LVL 9

Expert Comment

by:abhinayp86
ID: 34196983
You can find many Regular Expressions here.. Just do a search in it

http://regexlib.com/Search.aspx?k=limit
0
 
LVL 9

Expert Comment

by:abhinayp86
ID: 34197022
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Lots of people ask this question on how to extend the “MembershipProvider” to make use of custom authentication like using existing database or make use of some other way of authentication. Many blogs show you how to extend the membership provider c…
This article discusses the ASP.NET AJAX ModalPopupExtender control. In this article we will show how to use the ModalPopupExtender control, how to display/show/call the ASP.NET AJAX ModalPopupExtender control from javascript, how to show/display/cal…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

821 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question