Question

I have a lot of source codes with SQL queries like below:

c_query := "SELECT * FROM TABLE WHERE FIELD_NAME_ONE[2] = 'AB' AND FIELD_NAME_TWO[1,8] = 'ABCDEFGH'"

I would like to match these: FIELD_NAME_ONE[2] and FIELD_NAME_TWO[1,8] and these patterns must be found between double quotes (").

Edit

c_query := “SELECT * FROM TABLE WHERE FIELD_NAME_ONE[2] = ‘AB’ AND FIELD_NAME_TWO[1,8] = ‘ABCDEFGH’ AND TESTE[9] = ‘XXXXXXXXX’ AND FOO = ‘” + is_an_array[2] + “‘”

It shouldn´t match is_an_array[2] because is not inside the double quotes.

Answer 1

I’m assuming you want to be able to match more than just those two specific fields, otherwise you wouldn’t have gone to the trouble of applying regular expressions:

var tokens = Regex.Matches(sql, "\"([^\"]+)\"");

foreach (Match token in tokens) {
    string str = token.Groups[1].Value;

    var fields = Regex.Matches(str, @"(\w+\[\d+(,\d+)*\])");

    foreach (Match field in fields)
        Console.WriteLine(field.Value);
}

This will find any sequence of letters, numbers and underscores followed by square brackets, with 1 or more comma-separated numbers.

If you only want to match a sequence of letters and underscores before the square brackets, ammend the pattern to:

@"([a-zA-Z_]+\[\d+(,\d+)*\])"