Re: [GENERAL] Pattern Matching question - PG 9.6

2017-05-15 16:10 GMT+12:00 David G. Johnston <david.g.johnston@gmail.com>:

On Sunday, May 14, 2017, Patrick B <patrickbakerbr@gmail.com> wrote:

Demo: http://dbfiddle.uk/?rdbms=postgres_9.6&fiddle=3c3a3f870eb4d002c5b4200042b25669

The rows that I should be getting are:

5   /testfile/client/10/attachment/1000/master/   10

7   /testfile/client/10/attachment/unassigned/file/1001/master   10

8   /testfile/client/10/attachment/unassigned/file/1002/master   10

What am I doing wrong?

Without you explaining why 6 and 9 are invalid it's impossible to say how you should modify your regex to exclude them.  You may find positive and negative look-ahead useful though.

David J.

I thought I have already explained it. Here it goes again. Demo page is: http://dbfiddle.uk/?rdbms=postgres_9.6&fiddle=ea61e7e1859bdb7f297f853a9dc0e3d0

As you can see, there is a lot of variations for the same file_id (1000). File_id (1001/1002) is a new unassigned file, different from the others.

I wanna be able to get ONLY the 'master' variation ( /testfile/client/10/attachment/1000/master/ ) and the unassigned files variations [if any] (/testfile/client/10/attachment/unassigned/file/1001/master | /testfile/client/10/attachment/unassigned/file/1002/master).

So on the demo above, only id IN (5,9,10) are valid for me. The SELECT that I used as an example is not returning me ONLY the data I need, instead, it is returning (almost) everything.

To summarize: I wanna use a pattern matching the only returns these rows:

/testfile/client/10/attachment/1000/master/
/testfile/client/10/attachment/unassigned/file/1001/master
/testfile/client/10/attachment/unassigned/file/1002/master

What can I do to fix it?

Thanks

P.