How to set regular expression in TextBox?

Question

How to set regex on WPF TextBox? I want the text field to accept input in some kind of predefined format. Is it possible?

Answer 1

You have several options:

• You can create a subclass ValidationRule(see below) and add it to the Binding Validators Properties property
• You can set ValidationCallbackbound to your property, throw an exception if the value is incorrect, and use this technique to easily show validation errors.
• , TextBox.TextChanged
• TextBox TextBox_Changed
• PreviewKeyDown PreviewTextInput ,
• , Jan

WPF bound. PreviewKeyDown/PreviewTextInput .

ValidationRule:

public class RegexValidationRule : ValidationRule
{
  ... // Declare Regex property and Message property

  public override ValidationResult Validate(object value, CultureInfo cultureInfo)
  {
    if(Regex.IsMatch((string)value))
      return ValidationResult.ValidResult;
    else
      return new ValidationResult(false, Message);
  }
}

Answer 2

, , .