Finding Variations in a Words (like John, Johny, Jon, Jonathan) using regular expressions with .net
In this regular expression we are going to find out variations in a Words like John, Johny, Jon, Jonathan. Just take a look at above words they all same begining "jo".
Regular Expression Pattern
\b[jJ]o\w*\b
A description of the regular expression:
First or last character in a word
Any character in this class: [jJ]
o\w*\b
o
Alphanumeric, any number of repetitions
First or last character in a word
Sucessful Matches
John
Johny
Jon
Jonathan
joiee
How It Works
This regular expression will check for first character in a word (or begining of a word) followed by lower case or upper case character ‘j’ and ‘o’ with the combination of any Alphanumeric character for any number of repetitions and End of word.
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 Blank Lines using regular expressions</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<span>Valid Format: enter some spaces (or Whitespace)</span><br />
<asp:TextBox id="txtInput" runat="server"></asp:TextBox><br />
<asp:RegularExpressionValidator Id="vldRejex" RunAt="server" ControlToValidate="txtInput" ErrorMessage="Word can not start with jo" ValidationExpression="\b[jJ]o\w*\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
public bool vldRegex(string strInput)
{
//create Regular Expression Match pattern object
Regex myRegex = new Regex("\\b[jJ]o\\w*\\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[jJ]o\w*\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
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