regex validation in wpf

Question

4.00/5 (1 vote)

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Que 1)i would like to have only decimal point after value entered and two decimal points later.
No other special character other than .(dot) or alphabet is allowed

my code is

C#

private static bool IsTextNumeric(string str)
{
  System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex("[^0-9^.{1}^0-9]$");
            return reg.IsMatch(str);
}
 private void NumericOnly(System.Object sender, System.Windows.Input.TextCompositionEventArgs e)
{
   e.Handled = IsTextNumeric(e.Text);
}

private void txtbx_Capcity_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
   NumericOnly(txtbx_Capcity, e);
}

Que 2)Also I would like restrict the value in text box between Min and Max if possible using regex.

Thanks in Advance for Ur help

Posted 28-Jan-13 22:52pm

Swapnil Girme

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2 solutions

Solution 1

Your regex won't work. "." is a "match any character" character in a rexeg, so for a literal decimal point, you want "\."
If you are after numbers, point, two numbers then try:

C#

^\d+\.\d{2}$

C#

System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex(@"^\d+\.\d{2}$");

Get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions.

Posted 28-Jan-13 23:10pm

OriginalGriff

Comments

Joezer BH 29-Jan-13 5:21am

5+

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Swapnil Girme · Accepted Answer · 2013-01-29T00:15:00

Got a Solution

C#

private void txtbx_Capcity_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
  System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex("^[.][0-9]+$|^[0-9]*[.]{0,1}[0-9]*$");
  e.Handled = !regex.IsMatch((sender as TextBox).Text.Insert((sender as TextBox).SelectionStart, e.Text));
}