Finding all words ending with "ing" using regular expressions with .net

In this regular expression we are going to find all words ending with "ing". Means we are going to search words ending(last three character) will be "ing".

Regular Expression Pattern

\b\w+(ing\b)

A description of the regular expression:

\b\w+
First or last character in a word
Alphanumeric, one or more repetitions
[1]: A numbered capture group. [ing\b]
ing\b
ing
First or last character in a word

Sucessful Matches

processing
programming
scripting

How It Works

This regular expression will check for first character of a word, any Alphanumeric value one or more repetitions ending with "ing".

ASP.NET

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Finding all words ending with "ing" using regular expressions with .net</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<span>Valid Format: enter word end with "ing" </span><br />
<asp:TextBox id="txtInput" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator Id="vldRejex" RunAt="server" ControlToValidate="txtInput" ErrorMessage="word not end with ing" ValidationExpression="^\b\w+(ing\b)$">
</asp:RegularExpressionValidator><br />
<asp:Button Id="btnSubmit" RunAt="server" CausesValidation="True" Text="Submit"></asp:Button>
</div>
</form>
</body>
</html>

C#.NET

//use System.Text.RegularExpressions befour using this function
//using System.Text.RegularExpressions;
public bool vldRegex(string strInput)
{
//create Regular Expression Match pattern object
Regex myRegex = new Regex("^\\b\\w+(ing\\b)$");
//boolean variable to hold the status
bool isValid = false;
if (string.IsNullOrEmpty(strInput))
{
isValid = false;
}
else
{
isValid = myRegex.IsMatch(strInput);
}
//return the results
return isValid;
}

VB.NET

‘Imports System.Text.RegularExpressions befour using this function
Public Function vldRegex(ByVal strInput As String) As Boolean
‘create Regular Expression Match pattern object
Dim myRegex As New Regex("^\b\w+(ing\b)$")
‘boolean variable to hold the status
Dim isValid As Boolean = False
If strInput = "" Then
isValid = False
Else
isValid = myRegex.IsMatch(strInput)
End If
‘return the results
Return isValid
End Function

Tips n Tracks

Reference

Reference