Pattern recognition problem string

I have a small problem here. I'm trying to deal with the chains, but there are a few inconsistencies with the string format. The channels to follow this format:

In most of the six steps for each product: a-FIRST, SECOND B, C-THIRD,..., F-SIXTH. Some products may have less than 6 steps like:

I want to sort the channels based on PRODUCT. Please note that the word "Product1" is not written as "Product1" result Most of them using the product code as if the PRODUCT1 code number is XX-T-00125 then the first stage of this product is written XX-T-00125-one-FIRST XXXX where XXXX is an extra for descriptive purposes chain (XXXX have no specific rules). But there are a few cases of human error during entry. XX-T-00125-a-FIRST-> extra white space between A - and FIRST or the case where A is not written as a FIRST but has - SECOND. So here's what I have in mind: I want to determine the STAGE (A, B, C). Then, I will assume all of the characters before the A, B, C,... as the product code. What I want is to choose separate (product code). How do I get there? Thank you


Use regular expressions.

What version of Oracle are you using?
The following works in Oracle 10.1 (and), but from 11 REGEXP_SUBSTR might be better for you.

                 , '-\s*[A-F]\s*-.+$'
                 )     AS product
FROM     table_x

I hope that answers your question.
If not, post a small example data (CREATE TABLE and only relevant columns, INSERT statements), and the results you want from this data.
Examples of special cases, you may need to manage (as one free space, other delimiters as '-', simple letters A - F appearing several times,...)

Tags: Database

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