Regular expression for

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 does anyone know validationexpression for this. Let me know .



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:

    errormessage="Invalid input" />

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