DC wrote:
> I have this snippet:
>
> <tr>
> <td align="left">E-mail</td>
> <td>
> <asp:TextBox id="txtEmail" runat="server"
> MaxLength="100"></asp:TextBox>&nbsp;
> <asp:RegularExpressionValidator id="revEmail" runat="server"
> ErrorMessage="Enter a valid e-mail address"
> ControlToValidate="txtEmail"
>
> ValidationExpression="\b[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z0-9._%-]{2,4}\b">
> </asp:RegularExpressionValidator>
> </td>
> </tr>
>
> My question is why this regular expression is not invoked if I leave the
> textbox blank?
> My understanding is blank entry is not met the requirement of that regular
> expression.
>
> Am I missing something here?
>
> - DC
>
>

"Craig Deelsnyder" <cdeelsny@NO_SPAM_4_MEyahoo.com> wrote in message
news:eRyYSmr7DHA.1596@TK2MSFTNGP10.phx.gbl...
> DC wrote:
> > I have this snippet:
> >
> > <tr>
> > <td align="left">E-mail</td>
> > <td>
> > <asp:TextBox id="txtEmail" runat="server"
> > MaxLength="100"></asp:TextBox>&nbsp;
> > <asp:RegularExpressionValidator id="revEmail" runat="server"
> > ErrorMessage="Enter a valid e-mail address"
> > ControlToValidate="txtEmail"
> >
> >
ValidationExpression="\b[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z0-9._%-]{2,4}\b">
> > </asp:RegularExpressionValidator>
> > </td>
> > </tr>
> >
> > My question is why this regular expression is not invoked if I leave the
> > textbox blank?
> > My understanding is blank entry is not met the requirement of that
regular
> > expression.
> >
> > Am I missing something here?
> >
> > - DC
> >
> >
>
> Validators normally aren't enabled when something is left blank. Why
> that decision was made (especially for regex validators) I'll never
> know. Slap a RequiredFieldValidator on the field as well and all shall
> function properly (if not with a little extra maintenance on your part).
>
> --
> Craig Deelsnyder
> Microsoft MVP - ASP/ASP.NET

"Craig Deelsnyder" <cdeelsny@NO_SPAM_4_MEyahoo.com> wrote in message
news:eRyYSmr7DHA.1596@TK2MSFTNGP10.phx.gbl...
> DC wrote:
> > I have this snippet:
> >
> > <tr>
> > <td align="left">E-mail</td>
> > <td>
> > <asp:TextBox id="txtEmail" runat="server"
> > MaxLength="100"></asp:TextBox>&nbsp;
> > <asp:RegularExpressionValidator id="revEmail" runat="server"
> > ErrorMessage="Enter a valid e-mail address"
> > ControlToValidate="txtEmail"
> >
> >
ValidationExpression="\b[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z0-9._%-]{2,4}\b">
> > </asp:RegularExpressionValidator>
> > </td>
> > </tr>
> >
> > My question is why this regular expression is not invoked if I leave the
> > textbox blank?
> > My understanding is blank entry is not met the requirement of that
regular
> > expression.
> >
> > Am I missing something here?
> >
> > - DC
> >
> >
>
> Validators normally aren't enabled when something is left blank. Why
> that decision was made (especially for regex validators) I'll never
> know. Slap a RequiredFieldValidator on the field as well and all shall
> function properly (if not with a little extra maintenance on your part).
>
> --
> Craig Deelsnyder
> Microsoft MVP - ASP/ASP.NET