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


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