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Using Regular Expressions

To use regular expressions, use the RegExp Object.

The following example code uses regular expressions to determine whether or not the specified string is an email address.

[JavaScript]

str = "info@emurasoft.com";
re = new RegExp( "^[_a-z0-9-]+(\\.[_a-z0-9-]+)*@[a-z0-9-]+(\\.[a-z0-9-]+)*(\\.[a-z]{2,4})$", "i" );
result = re.test( str );
if( result ) {
    alert( "The email address is OK." );
}
else {
    alert( "The email address is invalid." );
}

[VBScript]

str = "info@emurasoft.com"
Set regEx = New RegExp
regEx.Pattern = "^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$"
regEx.IgnoreCase = True
result = regEx.Test( str )
If result Then
    alert "The email address is OK."
Else
    alert "The email address is invalid."
End If

References

Microsoft MSDN Library: Regular Expression Object (JavaScript)

Microsoft MSDN Library: RegExp Object (VBScript)

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