How to use the ASP.NET Regular expression validator

Question

I am trying to set the minimum number of characters for a textbox, and if the user input dos not reach the set minimum an error must show, In i was trying to do just that using <asp:RegularExperssionValidator> but the error message is nit showing, what am i missing or doing wrong?

<asp:TextBox ID="TextBox2" runat="server" CssClass="form-control"></asp:TextBox> 
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
    ErrorMessage="ID length is Less than 10" ControlToValidate="TextBox2" ValidationExpression=".{10}.*">
</asp:RegularExpressionValidator>

Add ^ and $ characters and try it like this "^[.]{10}$" Also Display="Static" or Dynamic if you don't use ajax callout extenders — Poody
– Poody, Commented Nov 7, 2016 at 7:36

Keshav_Nandhan · Accepted Answer · 2016-11-07 07:42:05Z

2

<asp:TextBox ID="TextBox2" runat="server" CssClass="form-control"></asp:TextBox> 
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
ErrorMessage="ID length is Less than 10" ControlToValidate="TextBox2" ValidationExpression="^[a-zA-Z0-9]{10,1000}$">
</asp:RegularExpressionValidator>
  <br />
  <asp:Button ID="Button1" runat="server" Text="Button" />

answered Nov 7, 2016 at 7:42

Keshav_Nandhan

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2 Comments

Keshav_Nandhan Over a year ago

try this @SibusisoShongwe

Sibusiso Shongwe Over a year ago

I assume this is the Range {10,1000}

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