Regular Expression

[jashimu]

Hi All, I am wondering how to validate date using regular expression and not allowing any future date if the user wants to put it in anyway. thanks,

[Shahriar Iqbal Chowdhury Galib]

Hi, no, it's not possible with regular expression, regular expression can only validate patterns, you can use compare validator for this purpose or use .NET function DateTime.Now to acquire todays date, then compare it programmatically with the date from user's input. Regular expression for date is (?x)(?:0[1-9]|1[0-2])(/?)(?:0[1-9]|[12][0-9]|3[01])(\1)\d{4}\d/\d/\d{4}

[Keith Barrow]

Just to add to Shahriar Iqbal Chowdhury's answer, you can use the regex validator to do an "idiot check" Client side and use dateTime.TryParse[^] to check server side. There are several attempts to do it here[^] without the regex using JavaScript instead. For the regex pattern, I've always found http://regexlib.com[^] useful, it also gives a summary of how well well the regex matches etc.

Sort of a cross between Lawrence of Arabia and Dilbert.[^]
-Or-
A Dead ringer for Kate Winslett[^]

[jashimu]

Thank you Iqbal bhi, I will get the user input and then compare with present date in the back end. thanks for the date format.

[jashimu]

thanks for your reply, I know it can be done using back end Csharp code. But how do I display message to user that something is wrong.

[berba]

hi check this please http://p2p.wrox.com/asp-net-1-1/5952-date-regular-expression.html[^] Try to see if you can use compare validator to check the future date..