simple textbox validation using regexvalidator

  • Thread starter Thread starter live your lives
  • Start date Start date
L

live your lives

i am trying to validate a simple username textbox using RegularExpressionValidator:

TextBox tbUserName = new TextBox();
tbUserName.ID = "tbUserName";

string strPatternUserName = @"\W";
// i've tried using "\\W", "\w", "\\w","@\w", "/\\w", etc...
// but it always prints my error msg UNLESS the textbox is set to "".
// why does this not work?

RegularExpressionValidator rev = new RegularExpressionValidator();
rev.ControlToValidate = "tbUserName";
rev.Text = "Please enter a username";
rev.ValidationExpression = strPatternUserName;
rev.Display = ValidatorDisplay.Static;
rev.EnableClientScript = false;

please help, thank you.
 
live your lives said:
i am trying to validate a simple username textbox using RegularExpressionValidator:

TextBox tbUserName = new TextBox();
tbUserName.ID = "tbUserName";

string strPatternUserName = @"\W";
// i've tried using "\\W", "\w", "\\w","@\w", "/\\w", etc...
// but it always prints my error msg UNLESS the textbox is set to "".
// why does this not work?
Click to expand...

The following method returns true:

private static bool TestRegex()
{
bool match = false;
string test = @"\William";

Regex expr = new Regex("^(\\\\W)");
match = expr.IsMatch(test);

return match;
}

When in doubt, use more backslashes.

- carl
 
The problem with the regularexpressionvalidator control is that it expects a
string, not a RegEx expression. Since they are of different types I cannot
pass a RegEx object into the regularexpressionvalidator control.

Anyhow, I got it working similar to the way you did it. It is rather
strange that more backslashes are used. Ah well, at least it works right.

Thanks for your help.
 
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