Re: Regular Expression Validator

Hello Mike,

Try "^[a-z]+$". That will also take care of requiring some text to be
entered, so if you're OK with having one error message taking care of
"you must enter stuff" and also "you must enter lowercase letters
only", IE "You must enter lowercase English letters", you can delete
your RequiredFieldValidator.

That isn't exactly true. The regexValidator by default does not trigger when the input is empty. This is done because the error message for a required field is different from an incorrect input.

The character group square brackets mean to match one character from
that group, so your current Regular Expression means the user must
enter one lowercase letter, possibly among other things. The +
modifier means it must match any of those characters at least once,
and you could also use the * modifier to match any of those characters
any number of times (zero is OK). Putting ^ at the beginning means it
must match that starting with the beginning, and ending with $ means
it must match that at the end, so together they mean the entire string
must match it.

-Michael Placentra II

On Oct 3, 12:57 pm, David <david.mccollo...@xxxxxxxxx> wrote:

I'm having trouble getting the regular expression validator to work
with a text box.

In this simple example I only want lower case letters to be allowed.
So I tried the following and it doesn't work, would somebody be so
kind as to tell me why.

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator
ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="RequiredFieldValidator"
ControlToValidate="TextBox1"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator
ID="RegularExpressionValidator1"
runat="server"
ErrorMessage="RegularExpressionValidator"
ControlToValidate="TextBox1"
ValidationExpression="[a-z]"></asp:RegularExpressionValidator>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button"
OnClick="Button1_Click" />
protected void Button1_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
Response.Write("Page is valid");
}
else
{
Response.Write("Page is not valid");
}
}
--
Jesse Houwing
jesse.houwing at sogeti.nl


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