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Following code validate username using pattern regular expression.
Max length =10 , min =4 .
We check that both numbers and characters.
Code:
<% 
    
' username 
    Dim username
    Dim regularExpressions = New Regex
    ' 
regular expression .
    
With regularExpressions
        
.Pattern "^[a-zA-Z0-9]{4,10}$"
        
.IgnoreCase True
        
.Global = True
    End With
    username 
"asi323"
     
show test against pattern.
    
Response.Write("asi323 tested with pattern ^[a-zA-Z0-9]{3,8}$ :" regularExpressions.test(username))
%>
 





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