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SSIS Derived column and regular expressions

Posted on 2010-09-20
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I have a data flow in SSIS similar to:

ID      CCODE
1        99024
2        71237
3        A4583
4        L8743

I have the following business rules:

•All codes that start with a “99” need to be first or “2” if there is no “99” code on the account.
•Next would be any codes that start with a “17” “12” “6” “2” “11”.
•Next would be the X-ray codes that start with a “7”.
•Then any codes that START with a letter, usually “A” “J” “L” “G” “Q” (HCPCS codes).

In order to sort, I was going to add a derived column in my data flow that added a new column and placed an order number in that column based on what it found in the CCODE column.

For example, I should get something like this:

ID      CCODE    DERIVEDORDER
1        99024            1
2        71237            3
3        A4583           4
4        L8743            4

Here is my derived column expression:

SUBSTRING(TransactionID,1,2) == "99" ? 1 : SUBSTRING(TransactionID,1,2) == "17" || SUBSTRING(TransactionID,1,2) == "12" || SUBSTRING(TransactionID,1,2) == "6%" || SUBSTRING(TransactionID,1,2) == "2%" || SUBSTRING(TransactionID,1,2) == "11" ? 2 : SUBSTRING(TransactionID,1,2) == "7%" ? 3 : SUBSTRING(TransactionID,1,2) == "[A-Z^]" ? 4 : 5

Everything works perfectly until I get to the last part - determining if CCODE starts with a letter.  That part does not work at all.  Specifically, the SUBSTRING(TransactionID,1,2) == "[A-Z^]" ? 4 : 5 part.

Is there a way using expressions in the derived column transform to determine if a string starts with letters?

JamesNT
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Question by:JamesNT
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vdr1620 earned 2000 total points
ID: 33717435
the expression cannot evaluate the value to TRUE...You can try use Codepoint instead Like CODEPOINT(Column).. using that you can check if the starting value is Alphabet or Number..

Numbers from 0 to 9 have a codepoint of 48-57 ..So you can check that condition in the IF else expression
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by:JamesNT
ID: 33721715
Working result:

SUBSTRING(TransactionID,1,2) == "99" ? 1 : SUBSTRING(TransactionID,1,2) == "17" || SUBSTRING(TransactionID,1,2) == "12" || SUBSTRING(TransactionID,1,2) == "6%" || SUBSTRING(TransactionID,1,2) == "2%" || SUBSTRING(TransactionID,1,2) == "11" ? 2 : SUBSTRING(TransactionID,1,2) == "7%" ? 3 : CODEPOINT(SUBSTRING(TransactionID,1,1)) < 48 || CODEPOINT(SUBSTRING(TransactionID,1,1)) > 57 ? 4 : CODEPOINT(SUBSTRING(TransactionID,LEN(TransactionID) - 1,1)) < 48 || CODEPOINT(SUBSTRING(TransactionID,LEN(TransactionID) - 1,1)) > 57 ? 5 : 6

Ugly, but functional.

For TransactionID:

All that start with 99 - Order = 1
All that start with 17, 12, 6, 2, 11 - Order = 2
All that start with 7 - Order = 3
All that start with a CODEPOINT <> 48 - 57 - Order = 4
All that end with a CODEPOINT <> 48 - 57 - Order = 5
All else - Order = 6

JamesNT
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Author Closing Comment

by:JamesNT
ID: 33721716
THANKS!!!
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