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SQL Server Tips by Gama and Naughter Consulting


Testing the Code

As is standard, the XP must be registered before it is used. Please refer to the “test.sql” file included in the XP_REGEXP folder; it handles the standard XP registration code and includes some test cases for each of the three XP’s.

To integrate this XP into a UDF (so that it mirrors the COM implementation provided in Cory Koski’s article), you would use:

@SourceText varchar(8000),
@RegExp varchar(1000),
@CaseSensitive bit
DECLARE @match bit
EXEC master..XP_REGEXP_ASCII @SourceText, @RegExp, @CaseSensitive, @match OUTPUT
RETURN (@match)

An example to check if a time has been entered in h:mm or hh:mm format would be:.

PRINT dbo.findRegex('1:57', '{[0-9]?[0-9]}:{[0-9][0-9]}', 0)
PRINT dbo.findRegex('01/03', '{[0-9]?[0-9]}:{[0-9][0-9]}', 0)

The first example should print “1” while the second should print “0”.

For more examples on using regular expressions as well as detailed information on the syntax for the ATL Server regular expression parser, please refer to the MSDN documentation for the ATL Server classes used.

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter





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