I really don't work with ASP.NET or C# so please excuse the naivety of my question. I normally develop using Python but for a certain project I need to decipher some C# and ASP.NET scripts. Here is a validator for a date input field as I understand;
ValidationExpression="^([0-2][0-9]|(3)[0-1])(\.)(((0)[0-9])|((1)[0-2]))(\.)\d{4}$"
My question is what would be a valid date input with this validator at hand?
I can guess the input but only partially, as I understand '\d{4}$' stand for a 4 digit number. Its formatted as 'd m Y' but I'm not sure what '(.)' stands for and would 1 digit days/months would be 01-05 or 1-5 etc.
In general a few examples of expected inputs would be a great help, and guessing is quite inefficent because I already need to guess lots of other parameters.
Again sorry for the probable simplicity of my question :).
Full element as it might be needed;
<div >
<asp:TextBox ID="txtBirthDate" runat="server" CssClass="form-control date-mask datePicker" Text='<%#Item.BirthDate %>'></asp:TextBox>
<asp:RequiredFieldValidator ValidationGroup="vgReservation" Display="Dynamic" CssClass="help-block" ID="rfvBirthDate" runat="server" ErrorMessage="Doğum Tarihi gereklidir." ControlToValidate="txtBirthDate" InitialValue=""></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ValidationGroup="vgReservation" Display="Dynamic" CssClass="help-block" ID="revBirthDate" runat="server" ErrorMessage="Doğum Tarihi geçerli bir tarih olmaldır." ControlToValidate="txtBirthDate" ValidationExpression="^([0-2][0-9]|(3)[0-1])(\.)(((0)[0-9])|((1)[0-2]))(\.)\d{4}$"></asp:RegularExpressionValidator>
</div>
CodePudding user response：
If you paste your regex into one of the many online testers, e.g.
It will break it down for you and explain the capture groups.
In this case, it looks like you tryig to validate dates like 10.2.2022, although I don't think the regex is particularly correct.