Tutorial :Regular Expression fails in IE, but works in Chrome and Firefox?



Question:

I have the following asp.net markup:

<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"     ValidationGroup="passwordValidation"></asp:TextBox>    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Display="Dynamic"  ControlToValidate="txtPassword" Text="Required" ValidationGroup="passwordValidation" />    <asp:RegularExpressionValidator runat="server" ControlToValidate="txtPassword"    Text="Passwords should contain a minimum of 7 characters with at least one numeric   character." ValidationExpression="^(?=.*\d{1})(?=.*[a-zA-Z]{2}).{7,}$"    ValidationGroup="passwordValidation" Display="Dynamic"></asp:RegularExpressionValidator>  

If I type in a password like test1234, it passes in chrome and firefox, but the message that my password should contain a minimum of 7 characters with at least one numeric character is shown in internet explorer


Solution:1

You're probably getting bitten by the infamous IE regex lookahead bug. You should be able to work around that by making the length check a lookahead like the other conditions, and putting it first.

^(?=.{7,}$)(?=.*\d)(?=.*[a-zA-Z]{2}).*  

But I think I see another problem. (?=.*[a-zA-Z]{2}) matches two consecutive letters; is that really your intent? If you want to require at least two letters, but not necessarily consecutive, you should use (?=.*[a-zA-Z].*[a-zA-Z]).


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