VB.net Tutorials with Examples

Single digit	Description
\d	Accepts a single digit
/D	Accepts a single character
\w	Accepts any character other than a white space (spacebar)
\s	Accepts a space
[A-Za-z]	Accepts upper or lower case characters
[0-9]	Accepts a numerical value
^[0-9]	Accepts any characters other than numeric value

It is used to specify the occurrence of the meta characters within the expression.

meta characters	Description
{number}	Accepts the input if the length of the expression is equal to the specified number E.g.: \d{5} à accepts 5 digits number
{Minnumber, }	Accepts the input if the length after expression is greater than or equal to the specified Minnumber.E.g: [A-Za-z0-9_]{6, }
{Minnumber, Maxnumber}	Accepts the input if the length of the expression is between the specified range.e.g.: \D{6,8}

Mode

It is used to specify the occurrence of the meta characters within the expression.

Mode	MinOccurrence	MaxOccurrence
?	0	1
. or *	0	Any
+	1	Any

E.g.: \d{1, } <==> \d+

[ma+am] => accepts ‘madam, Malayalam ……

.ASPX CODE

<asp:TextBox ID="TextBox1" runat=
  "server">
</asp:TextBox><asp:
RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
 ControlToValidate="TextBox1" ErrorMessage="plese enter email ID" 
ToolTip=

"plese Enter email id" ValidationExpression=
"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">
</asp:RegularExpressionValidator>