Quickly Replace Non-Numeric characters In a String

If you have a requirement where in you do not want to prevent users from entering non-numeric characters in a textbox, however want to filter out all the non-numeric characters, then here's how to do so:

First import the namespace System.Text.RegularExpressions;

C#


    // Replace non-numeric characters 

    string str = "12d223*23#22";

    string newStr = Regex.Replace(str, @"[^\d]", "");

 

    // Displays 122232322



VB.NET


    ' Replace non-numeric characters 

    Dim str As String = "12d223*23#22"

    Dim newStr As String = Regex.Replace(Str, "[^\d]", "")

 

    ' Displays 122232322



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About The Author

Suprotim Agarwal
Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

3 comments:

Greg S said...

This was perfect - thanks for the great (and simple) post!

Anonymous said...

Regex.Replace has a speed problem, will be your slowest line on your code, use with caution.

Anonymous said...

THANKS !!!!!