Using Regex to extract table names from a file containing SQL queries

Question

I\'ve a text file containing large number of queries. I want to get all the distinct tables used in the entire file in all the queries. The table name can come after a \'fro

Answer 1

I'd use:

r = new Regex("(from|join)\s+(?\S+)", RegexOptions.IgnoreCase);
once you have the Match object "m", you'll have the table name with
m.Groups["table"].Value
example:
string line = @"select * from tb_name join tb_name2 ON a=b WHERE x=y";
Regex r = new Regex(@"(from|join)\s+(?
\S+)",
         RegexOptions.IgnoreCase|RegexOptions.Compiled);

Match m = r.Match(line);
while (m.Success) {
   Console.WriteLine (m.Groups["table"].Value);
   m = m.NextMatch();
}
it will print:
tb_table
tb_table2

                                                        

              
                
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