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Regular Expressions

 
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QuestionHow to retain characters preceding a match? Pin
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QuestionUsing back references to find data type naming standards violations Pin
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AnswerRe: Using back references to find data type naming standards violations Pin
George Jonsson16-Apr-16 19:36
professionalGeorge Jonsson16-Apr-16 19:36 
There is most likely a more elegant way to do this, but this expression should work.

[EDIT] It is the second group that should be back-referenced, hence \2
Dim\s+(?<variable_name>\w_\w_\w+_(?<expected_type>\w+)_\w+)\s+As\s+(?:(?<matched_type>\2)|(?<mismatched_type>\w+))


The line
Dim L_V_Scalar_Integer_Item As Integer

will give the result
expected_type   matched_type   mismatched_type
Integer         Integer


The line
Dim L_V_Scalar_Integer_Item As String

will give the result
expected_type   matched_type   mismatched_type
Integer                        String


Example in c#
Match m = Regex.Match("Dim L_V_Scalar_Integer_Item As String", 
"Dim\s+(?<variable_name>\w_\w_\w+_(?<expected_type>\w+)_\w+)\s+As\s+(?:(?<matched_type>\2)|(?<mismatched_type>\w+))");
if (m.Success)
{
    // For example, check if the group named 'matched_type' is empty
    // This means that there is a violation of the naming convention
    if (String.IsNullOrEmpty(m.Groups["matched_type"].Value))
    {
        string errorText = String.Format(@"The type '{0}' is not allowed for variable name '{1}'. 
        The correct type is '{2}'", 
        m.Groups["mismatched_type"].Value,
        m.Groups["variable_name"].Value,
        m.Groups["expected_type"].Value);
    }
}
else
{
    // Do some error handling for a failed match
}


modified 18-Apr-16 1:30am.

GeneralRe: Using back references to find data type naming standards violations Pin
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AnswerRe: Using back references to find data type naming standards violations Pin
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QuestionRe: Using back references to find data type naming standards violations Pin
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AnswerRe: Using back references to find data type naming standards violations Pin
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Questionnegation of an expression Pin
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QuestionHelp with regex HTML form validation Part 2 Pin
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AnswerRe: Help with regex HTML form validation Part 2 Pin
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AnswerRe: Help with regex HTML form validation Part 2 Pin
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AnswerRe: Help with regex HTML form validation Part 2 Pin
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