Make regular expression case insensitive in ASP.NET RegularExpressionValidator

Question

Given this regular expression: \"^[0-9]*\\s*(lbs|kg|kgs)$\" how do I make it case insensitive? I am trying to use this in a .net regular expression validator,

Answer 1

Here is an alternative using a CustomValidator, when really needing case-insensitivity server-side and client-side; and the the Upper/lower [A-Za-z] char approach is too much.

This blends the various other answers, using the server-side RegEx object and client-side JavaScript syntax.

CustomValidator:

Code behind:

protected void cvWeight_Validate(object sender, ServerValidateEventArgs args)
{
    Regex re = new Regex(@"^[0-9]*\s*(lbs|kg|kgs)$", RegexOptions.IgnoreCase);
    args.IsValid = re.IsMatch(args.Value);
}

Client-side validation function:

function cvWeight_Validate(sender, args) {
  var reWeight = /^[0-9]*\s*(lbs|kg|kgs)$/i;
  args.IsValid = reWeight.test(args);
}

This is working fine for me, except when using a ValidationSummary. On the client-side validation, the error * shows, but I can't get the error message to display in the summary. The summary only displays when submitted. I think it's supposed to display; I have a mix of update panels and legacy code, which may be problems.