Regular expression to find all table names in a query

Question

I am not that hot at regular expressions and it has made my little mind melt some what.

I am trying to find all the tables names in a query. So say I have the query

Answer 1

One workaround is to implement a naming convention on tables and views. Then the SQL statement can be parsed on the naming prefix.

For example:

SELECT tbltable1.one, tbltable1.two, tbltable2.three
FROM tbltable1
    INNER JOIN  tbltable2
        ON tbltable1.one = tbltable2.three

Split whitespace to array:

("SELECT","tbltable1.one,","tbltable1.two,","tbltable2.three","FROM","tbltable1","INNER","JOIN","tbltable2","ON","tbltable1.one","=","tbltable2.three")

Get left of elements to period:

("SELECT","tbltable1","tbltable1","tbltable2","FROM","tbltable1","INNER","JOIN","tbltable2","ON","tbltable1","=","tbltable2")

Remove elements with symbols:

("SELECT","tbltable1","tbltable1","tbltable2","FROM","tbltable1","INNER","JOIN","tbltable2","ON","tbltable1","tbltable2")

Reduce to unique values:

("SELECT","tbltable1","tbltable2","FROM","INNER","JOIN","ON")

Filter on Left 3 characters = "tbl"

("tbltable1","tbltable2")