如何从SQL Server select语句中修剪包含两个字母和五个数字的文本？

Question

I would like to write a select query to output only the text containing of two letters and five digits.

The data type is varchar(max) .

Each column may contain more than one of these numbers and also may contain a lots of other text. The server is a SQL Server 2012.

Sample data 1:

Reg.nr: AA11111, Dette er et teksttekst pa et test abonnement.
Referanse: Faktura 2222222222, Beløp: 1572.91,
Referanse: Purregebyr, Beløp: -64.00.

12.12.12 13:00:00 AAA
Utring ingen svar

18.12.14 18:00:00 BBB
tekst tekst tekst

14.01.15 15:00:00 CCC
tekst tekst tekst

Sample data 2:

text text text
AA11111 text,
BB22222 text,
text text

Desired output:

Sample data 1: AA11111
Sample data 2: AA11111, BB22222

Answer 1

Try this:

SELECT 
    SUBSTRING(col, PATINDEX('%[a-zA-Z][a-zA-Z][0-9][0-9][0-9][0-9][0-9]%', '' + col), 7)
FROM TEST
WHERE PATINDEX('%[a-zA-Z][a-zA-Z][0-9][0-9][0-9][0-9][0-9]%', '' + col) <> 0

Here is a SQLFiddle with how the query works.