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Regular expression for Asp.net text box conrol

Posted on 2010-11-22
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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>
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Question by:brgdotnet
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8 Comments
 
LVL 35

Accepted Solution

by:
Terry Woods earned 800 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}$">
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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.
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LVL 20

Expert Comment

by:informaniac
ID: 34193913
Why not use the MaxLength=255 property of textbox
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LVL 20

Expert Comment

by:informaniac
ID: 34193917
Sry. missed out the multine thing..
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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" />
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LVL 29

Assisted Solution

by:Kumaraswamy R
Kumaraswamy R earned 160 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 />
   
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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
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LVL 9

Expert Comment

by:abhinayp86
ID: 34197022
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