Regular expression for asp.net

Question

I need some help in regular expression. I am validating the textbox text when updating the records. When i click the update button, the first 5 letters should be equal to CM000 or cm000. How to validate this using regular expression in asp.net. does anyone know validationexpression for this. Let me know .

Thanks

Andrew Hare · Accepted Answer · 2010-12-02 00:48:49Z

1

You don't need a regex - do this instead:

bool isValid 
    = textBox.Text.StartsWith("CM000", StringComparison.OrdinalIgnoreCase);

If you must use a regex (like for a validation control) then use something like this:

<asp:RegularExpressionValidator 
    runat="server" 
    id="someId" 
    controltovalidate="textBox"
    validationexpression="^(?:CM|cm)000"
    errormessage="Invalid input" />

edited Dec 2, 2010 at 0:48

answered Dec 1, 2010 at 21:02

Andrew Hare

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4 Comments

Tronics Over a year ago

do i need to use this in javascript?

Andrew Hare Over a year ago

@user356973 - It depends, how are you validating the control?

Andrew Hare Over a year ago

Nelson - Yes, it would but there is no need to capture if you are never going to use the result. But you are right, I don't need two groupings here - I will fix my answer.

Nelson Rothermel Over a year ago

Good point on not capturing; I always forget that exists. Also, just a quick note on RegularExpressionValidator is that it automatically adds the ^ and $ (start/end of text). See: stackoverflow.com/questions/678698/…

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