How Do I Get A Return A Certain String Before And After 2 Characters

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I can write any query from a text box for eg..

SQL

Select * from table

select product from food

Delete * from good

select product,quantity,id from food

How can i get the food or the word just after the word FROM

i need to extact just table name

please help anyone

Posted 8-Mar-14 8:14am

mrukr

Updated 8-Mar-14 8:20am

Maciej Los

v2

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Maciej Los 8-Mar-14 14:21pm

What have you tried? Where are you stuck?

mrukr 8-Mar-14 14:28pm

Dim str As String = textbox1.text
If str.Contains("FROM"C) Then
Dim index As Integer = str.IndexOf("FROM"C)
Dim result As String = str.Substring(0, index)
Console.WriteLine("result: " & result)
End If

im not sure if this is not working for the result

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Maciej Los · Accepted Answer · 2014-03-08T08:27:00

Please, read my comment to the question.

All you need to do is to find FROM word than to extract table name.
How to: Search Strings Using String Methods (C# Programming Guide)[^]
How to: Search Within a String (Visual Basic)[^]
How to: Search Strings Using Regular Expressions (C# Programming Guide)[^] - true, it's c#, but you can convert it via for example developerfusion online converter[^]

But i need to warn you. In some cases, sql query could looks like:

SQL

SELECT <field list>
FROM (
    SELECT <field list>
    FROM TableName
    WHERE <condition>
) AS T
WHERE <condition>

What do you expect to find?

Please, read these articles:
SQL Parser[^]
Microsoft.SqlServer.Management.SqlParser.Parser Namespace[^]
There you'll find many usefull information.