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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.


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." );


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."
    alert "The email address is invalid."
End If


Microsoft MSDN Library: Regular Expression Object (JavaScript)

Microsoft MSDN Library: RegExp Object (VBScript)

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