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Tip of the Day
Language: VB7
Expertise: beginner
Jul 14, 2003

IsValidRegularExpression - Checking whether a given regular expression is in valid format

' Check whether a given regular expression is in valid format
' Examples:
'   Debug.WriteLine(IsValidRegularExpression("^((\(\d{3}\) 
' ?)|(\d{3}-))?\d{3}-\d{4}$")) ' => True
'   Debug.WriteLine(IsValidRegularExpression("^[|)$")) ' => False

Function IsValidRegularExpression(ByVal regex As String) As Boolean
    Try
        Dim r As New System.Text.RegularExpressions.Regex(regex)
        ' if the line above did not throw an exception, the expression is valid
        Return True
    Catch ex As Exception
        Return False
    End Try
End Function
Marco Bellinaso
 
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