Добро пожаловать в StackOverflow.В будущем постарайтесь включить некоторые легко потребляемые образцы данных, такие как то, что я включаю в свое решение ниже.
Это забавная маленькая проблема.Для такого рода вещей я использую свою функцию patExtract8K, которая использует ngrams8K .Вот пример того, как использовать PatExtract;здесь я извлекаю деньги из строки:
SELECT p.*
FROM dbo.patextract8K('Pay me $50.17 now or $1000 later!','[^$0-9.]') AS p;
Результаты:
itemNumber itemIndex itemLength item
----------- ---------- ----------- --------
1 8 6 $50.17
2 22 5 $1000
Теперь, чтобы решить вашу проблему:
-- Easily consumable sample data
DECLARE @table TABLE (shiftId VARCHAR(2), empKey VARCHAR(5), workDuration VARCHAR(100));
INSERT @table(shiftId,empKey,workDuration)
VALUES
('K','A','12PM - 4PM'),
('K','B','12PM - 4PM'),
('K','A','9AM - 12PM'),
('K','A','4PM - 6PM');
-- Solution
SELECT
shiftId = f.shiftId,
KeyIn = '1/1,'+REPLACE(CONVERT(VARCHAR(10),
MIN(CAST(f.c1 AS TIME)) OVER (),100),':00',''),
KeyOut = '1/1,'+REPLACE(CONVERT(VARCHAR(10),
MAX(CAST(f.c2 AS TIME)) OVER (),100),':00',''),
empShift = f.empKey,
othEmpIn = '1/1,'+f.c1,
othEmpOut = '1/1,'+f.c2
FROM
(
SELECT t.shiftId, t.empKey, t.workDuration,
c1 = MAX(CASE p.itemNumber WHEN 1 THEN p.item END),
c2 = MAX(CASE p.itemNumber WHEN 2 THEN p.item END)
FROM @table AS t
CROSS APPLY dbo.patExtract8k(t.workDuration, '[^0-9APM]') AS p
CROSS APPLY (VALUES(CAST(p.item AS TIME))) AS tm(N)
GROUP BY t.shiftId, t.empKey, t.workDuration
) AS f;
Результаты:
shiftId KeyIn KeyOut empShift othEmpIn othEmpOut
------- ---------- ------------ -------- ------------ ------------
K 1/1,9AM 1/1,6PM A 1/1,12PM 1/1,4PM
K 1/1,9AM 1/1,6PM A 1/1,4PM 1/1,6PM
K 1/1,9AM 1/1,6PM A 1/1,9AM 1/1,12PM
K 1/1,9AM 1/1,6PM B 1/1,12PM 1/1,4PM
Обратите внимание, что я понятия не имею, откуда взялась "1/1", поэтому я просто жестко запрограммировал это.
Вот мои основные функции.Все они очень полезны для эффективного решения широкого спектра проблем SQL с небольшим количеством кода.
CREATE FUNCTION dbo.rangeAB
(
@low bigint,
@high bigint,
@gap bigint,
@row1 bit
)
/****************************************************************************************
[Purpose]:
Creates up to 531,441,000,000 sequentia1 integers numbers beginning with @low and ending
with @high. Used to replace iterative methods such as loops, cursors and recursive CTEs
to solve SQL problems. Based on Itzik Ben-Gan's getnums function with some tweeks and
enhancements and added functionality. The logic for getting rn to begin at 0 or 1 is
based comes from Jeff Moden's fnTally function.
The name range because it's similar to clojure's range function. The name "rangeAB" as
used because "range" is a reserved SQL keyword.
[Author]: Alan Burstein
[Compatibility]:
SQL Server 2008+ and Azure SQL Database
[Syntax]:
SELECT r.RN, r.OP, r.N1, r.N2
FROM dbo.rangeAB(@low,@high,@gap,@row1) AS r;
[Parameters]:
@low = a bigint that represents the lowest value for n1.
@high = a bigint that represents the highest value for n1.
@gap = a bigint that represents how much n1 and n2 will increase each row; @gap also
represents the difference between n1 and n2.
@row1 = a bit that represents the first value of rn. When @row = 0 then rn begins
at 0, when @row = 1 then rn will begin at 1.
[Returns]:
Inline Table Valued Function returns:
rn = bigint; a row number that works just like T-SQL ROW_NUMBER() except that it can
start at 0 or 1 which is dictated by @row1.
op = bigint; returns the "opposite number that relates to rn. When rn begins with 0 and
ends with 10 then 10 is the opposite of 0, 9 the opposite of 1, etc. When rn begins
with 1 and ends with 5 then 1 is the opposite of 5, 2 the opposite of 4, etc...
n1 = bigint; a sequential number starting at the value of @low and incrimentingby the
value of @gap until it is less than or equal to the value of @high.
n2 = bigint; a sequential number starting at the value of @low+@gap and incrimenting
by the value of @gap.
[Dependencies]:
N/A
[Developer Notes]:
1. The lowest and highest possible numbers returned are whatever is allowable by a
bigint. The function, however, returns no more than 531,441,000,000 rows (8100^3).
2. @gap does not affect rn, rn will begin at @row1 and increase by 1 until the last row
unless its used in a query where a filter is applied to rn.
3. @gap must be greater than 0 or the function will not return any rows.
4. Keep in mind that when @row1 is 0 then the highest row-number will be the number of
rows returned minus 1
5. If you only need is a sequential set beginning at 0 or 1 then, for best performance
use the RN column. Use N1 and/or N2 when you need to begin your sequence at any
number other than 0 or 1 or if you need a gap between your sequence of numbers.
6. Although @gap is a bigint it must be a positive integer or the function will
not return any rows.
7. The function will not return any rows when one of the following conditions are true:
* any of the input parameters are NULL
* @high is less than @low
* @gap is not greater than 0
To force the function to return all NULLs instead of not returning anything you can
add the following code to the end of the query:
UNION ALL
SELECT NULL, NULL, NULL, NULL
WHERE NOT (@high&@low&@gap&@row1 IS NOT NULL AND @high >= @low AND @gap > 0)
This code was excluded as it adds a ~5% performance penalty.
8. There is no performance penalty for sorting by rn ASC; there is a large performance
penalty for sorting in descending order WHEN @row1 = 1; WHEN @row1 = 0
If you need a descending sort the use op in place of rn then sort by rn ASC.
Best Practices:
--===== 1. Using RN (rownumber)
-- (1.1) The best way to get the numbers 1,2,3...@high (e.g. 1 to 5):
SELECT RN FROM dbo.rangeAB(1,5,1,1);
-- (1.2) The best way to get the numbers 0,1,2...@high-1 (e.g. 0 to 5):
SELECT RN FROM dbo.rangeAB(0,5,1,0);
--===== 2. Using OP for descending sorts without a performance penalty
-- (2.1) The best way to get the numbers 5,4,3...@high (e.g. 5 to 1):
SELECT op FROM dbo.rangeAB(1,5,1,1) ORDER BY rn ASC;
-- (2.2) The best way to get the numbers 0,1,2...@high-1 (e.g. 5 to 0):
SELECT op FROM dbo.rangeAB(1,6,1,0) ORDER BY rn ASC;
--===== 3. Using N1
-- (3.1) To begin with numbers other than 0 or 1 use N1 (e.g. -3 to 3):
SELECT N1 FROM dbo.rangeAB(-3,3,1,1);
-- (3.2) ROW_NUMBER() is built in. If you want a ROW_NUMBER() include RN:
SELECT RN, N1 FROM dbo.rangeAB(-3,3,1,1);
-- (3.3) If you wanted a ROW_NUMBER() that started at 0 you would do this:
SELECT RN, N1 FROM dbo.rangeAB(-3,3,1,0);
--===== 4. Using N2 and @gap
-- (4.1) To get 0,10,20,30...100, set @low to 0, @high to 100 and @gap to 10:
SELECT N1 FROM dbo.rangeAB(0,100,10,1);
-- (4.2) Note that N2=N1+@gap; this allows you to create a sequence of ranges.
-- For example, to get (0,10),(10,20),(20,30).... (90,100):
SELECT N1, N2 FROM dbo.rangeAB(0,90,10,1);
-- (4.3) Remember that a rownumber is included and it can begin at 0 or 1:
SELECT RN, N1, N2 FROM dbo.rangeAB(0,90,10,1);
[Examples]:
--===== 1. Generating Sample data (using rangeAB to create "dummy rows")
-- The query below will generate 10,000 ids and random numbers between 50,000 and 500,000
SELECT
someId = r.rn,
someNumer = ABS(CHECKSUM(NEWID())%450000)+50001
FROM rangeAB(1,10000,1,1) r;
--===== 2. Create a series of dates; rn is 0 to include the first date in the series
DECLARE @startdate DATE = '20180101', @enddate DATE = '20180131';
SELECT r.rn, calDate = DATEADD(dd, r.rn, @startdate)
FROM dbo.rangeAB(1, DATEDIFF(dd,@startdate,@enddate),1,0) r;
GO
--===== 3. Splitting (tokenizing) a string with fixed sized items
-- given a delimited string of identifiers that are always 7 characters long
DECLARE @string VARCHAR(1000) = 'A601225,B435223,G008081,R678567';
SELECT
itemNumber = r.rn, -- item's ordinal position
itemIndex = r.n1, -- item's position in the string (it's CHARINDEX value)
item = SUBSTRING(@string, r.n1, 7) -- item (token)
FROM dbo.rangeAB(1, LEN(@string), 8,1) r;
GO
--===== 4. Splitting (tokenizing) a string with random delimiters
DECLARE @string VARCHAR(1000) = 'ABC123,999F,XX,9994443335';
SELECT
itemNumber = ROW_NUMBER() OVER (ORDER BY r.rn), -- item's ordinal position
itemIndex = r.n1+1, -- item's position in the string (it's CHARINDEX value)
item = SUBSTRING
(
@string,
r.n1+1,
ISNULL(NULLIF(CHARINDEX(',',@string,r.n1+1),0)-r.n1-1, 8000)
) -- item (token)
FROM dbo.rangeAB(0,DATALENGTH(@string),1,1) r
WHERE SUBSTRING(@string,r.n1,1) = ',' OR r.n1 = 0;
-- logic borrowed from: http://www.sqlservercentral.com/articles/Tally+Table/72993/
--===== 5. Grouping by a weekly intervals
-- 5.1. how to create a series of start/end dates between @startDate & @endDate
DECLARE @startDate DATE = '1/1/2015', @endDate DATE = '2/1/2015';
SELECT
WeekNbr = r.RN,
WeekStart = DATEADD(DAY,r.N1,@StartDate),
WeekEnd = DATEADD(DAY,r.N2-1,@StartDate)
FROM dbo.rangeAB(0,datediff(DAY,@StartDate,@EndDate),7,1) r;
GO
-- 5.2. LEFT JOIN to the weekly interval table
BEGIN
DECLARE @startDate datetime = '1/1/2015', @endDate datetime = '2/1/2015';
-- sample data
DECLARE @loans TABLE (loID INT, lockDate DATE);
INSERT @loans SELECT r.rn, DATEADD(dd, ABS(CHECKSUM(NEWID())%32), @startDate)
FROM dbo.rangeAB(1,50,1,1) r;
-- solution
SELECT
WeekNbr = r.RN,
WeekStart = dt.WeekStart,
WeekEnd = dt.WeekEnd,
total = COUNT(l.lockDate)
FROM dbo.rangeAB(0,datediff(DAY,@StartDate,@EndDate),7,1) r
CROSS APPLY (VALUES (
CAST(DATEADD(DAY,r.N1,@StartDate) AS DATE),
CAST(DATEADD(DAY,r.N2-1,@StartDate) AS DATE))) dt(WeekStart,WeekEnd)
LEFT JOIN @loans l ON l.lockDate BETWEEN dt.WeekStart AND dt.WeekEnd
GROUP BY r.RN, dt.WeekStart, dt.WeekEnd ;
END;
--===== 6. Identify the first vowel and last vowel in a along with their positions
DECLARE @string VARCHAR(200) = 'This string has vowels';
SELECT TOP(1) position = r.rn, letter = SUBSTRING(@string,r.rn,1)
FROM dbo.rangeAB(1,LEN(@string),1,1) r
WHERE SUBSTRING(@string,r.rn,1) LIKE '%[aeiou]%'
ORDER BY r.rn;
-- To avoid a sort in the execution plan we'll use op instead of rn
SELECT TOP(1) position = r.op, letter = SUBSTRING(@string,r.op,1)
FROM dbo.rangeAB(1,LEN(@string),1,1) r
WHERE SUBSTRING(@string,r.rn,1) LIKE '%[aeiou]%'
ORDER BY r.rn;
---------------------------------------------------------------------------------------
[Revision History]:
Rev 00 - 20140518 - Initial Development - Alan Burstein
Rev 01 - 20151029 - Added 65 rows to make L1=465; 465^3=100.5M. Updated comment section
- Alan Burstein
Rev 02 - 20180613 - Complete re-design including opposite number column (op)
Rev 03 - 20180920 - Added additional CROSS JOIN to L2 for 530B rows max - Alan Burstein
****************************************************************************************/
RETURNS TABLE WITH SCHEMABINDING AS RETURN
WITH L1(N) AS
(
SELECT 1
FROM (VALUES
(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),
(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),(0),
(0),(0)) T(N) -- 90 values
),
L2(N) AS (SELECT 1 FROM L1 a CROSS JOIN L1 b CROSS JOIN L1 c),
iTally AS (SELECT rn = ROW_NUMBER() OVER (ORDER BY (SELECT 1)) FROM L2 a CROSS JOIN L2 b)
SELECT
r.RN,
r.OP,
r.N1,
r.N2
FROM
(
SELECT
RN = 0,
OP = (@high-@low)/@gap,
N1 = @low,
N2 = @gap+@low
WHERE @row1 = 0
UNION ALL -- COALESCE required in the TOP statement below for error handling purposes
SELECT TOP (ABS((COALESCE(@high,0)-COALESCE(@low,0))/COALESCE(@gap,0)+COALESCE(@row1,1)))
RN = i.rn,
OP = (@high-@low)/@gap+(2*@row1)-i.rn,
N1 = (i.rn-@row1)*@gap+@low,
N2 = (i.rn-(@row1-1))*@gap+@low
FROM iTally AS i
ORDER BY rn
) AS r
WHERE @high&@low&@gap&@row1 IS NOT NULL AND @high >= @low AND @gap > 0;
GO
IF OBJECT_ID('dbo.NGrams8k', 'IF') IS NOT NULL DROP FUNCTION dbo.NGrams8k;
GO
CREATE FUNCTION dbo.NGrams8k
(
@string VARCHAR(8000), -- Input string
@N INT -- requested token size
)
/*****************************************************************************************
[Purpose]:
A character-level N-Grams function that outputs a contiguous stream of @N-sized tokens
based on an input string (@string). Accepts strings up to 8000 varchar characters long.
For more information about N-Grams see: http://en.wikipedia.org/wiki/N-gram.
[Author]:
Alan Burstein
[Compatibility]:
SQL Server 2008+, Azure SQL Database
[Syntax]:
--===== Autonomous
SELECT ng.position, ng.token
FROM dbo.NGrams8k(@string,@N) AS ng;
--===== Against a table using APPLY
SELECT s.SomeID, ng.position, ng.token
FROM dbo.SomeTable AS s
CROSS APPLY dbo.NGrams8K(s.SomeValue,@N) AS ng;
[Parameters]:
@string = The input string to split into tokens.
@N = The size of each token returned.
[Returns]:
Position = BIGINT; the position of the token in the input string
token = VARCHAR(8000); a @N-sized character-level N-Gram token
[Dependencies]:
1. dbo.rangeAB (iTVF)
[Developer Notes]:
1. NGrams8k is not case sensitive;
2. Many functions that use NGrams8k will see a huge performance gain when the optimizer
creates a parallel execution plan. One way to get a parallel query plan (if the
optimizer does not choose one) is to use make_parallel by Adam Machanic which can be
found here:
sqlblog.com/blogs/adam_machanic/archive/2013/07/11/next-level-parallel-plan-porcing.aspx
3. When @N is less than 1 or greater than the datalength of the input string then no
tokens (rows) are returned. If either @string or @N are NULL no rows are returned.
This is a debatable topic but the thinking behind this decision is that: because you
can't split 'xxx' into 4-grams, you can't split a NULL value into unigrams and you
can't turn anything into NULL-grams, no rows should be returned.
For people who would prefer that a NULL input forces the function to return a single
NULL output you could add this code to the end of the function:
UNION ALL
SELECT 1, NULL
WHERE NOT(@N > 0 AND @N <= DATALENGTH(@string)) OR (@N IS NULL OR @string IS NULL)
4. NGrams8k is deterministic. For more about deterministic functions see:
https://msdn.microsoft.com/en-us/library/ms178091.aspx
[Examples]:
--===== 1. Split the string, "abcd" into unigrams, bigrams and trigrams
SELECT ng.position, ng.token FROM dbo.NGrams8k('abcd',1) AS ng; -- unigrams (@N=1)
SELECT ng.position, ng.token FROM dbo.NGrams8k('abcd',2) AS ng; -- bigrams (@N=2)
SELECT ng.position, ng.token FROM dbo.NGrams8k('abcd',3) AS ng; -- trigrams (@N=3)
--===== How many times the substring "AB" appears in each record
DECLARE @table TABLE(stringID int identity primary key, string varchar(100));
INSERT @table(string) VALUES ('AB123AB'),('123ABABAB'),('!AB!AB!'),('AB-AB-AB-AB-AB');
SELECT string, occurances = COUNT(*)
FROM @table t
CROSS APPLY dbo.NGrams8k(t.string,2) AS ng
WHERE ng.token = 'AB'
GROUP BY string;
[Revision History]:
------------------------------------------------------------------------------------------
Rev 00 - 20140310 - Initial Development - Alan Burstein
Rev 01 - 20150522 - Removed DQS N-Grams functionality, improved iTally logic. Also Added
conversion to bigint in the TOP logic to remove implicit conversion
to bigint - Alan Burstein
Rev 03 - 20150909 - Added logic to only return values if @N is greater than 0 and less
than the length of @string. Updated comment section. - Alan Burstein
Rev 04 - 20151029 - Added ISNULL logic to the TOP clause for the @string and @N
parameters to prevent a NULL string or NULL @N from causing "an
improper value" being passed to the TOP clause. - Alan Burstein
Rev 05 - 20171228 - Small simplification; changed:
(ABS(CONVERT(BIGINT,(DATALENGTH(ISNULL(@string,''))-(ISNULL(@N,1)-1)),0)))
to:
(ABS(CONVERT(BIGINT,(DATALENGTH(ISNULL(@string,''))+1-ISNULL(@N,1)),0)))
Rev 06 - 20180612 - Using CHECKSUM(N) in the to convert N in the token output instead of
using (CAST N as int). CHECKSUM removes the need to convert to int.
Rev 07 - 20180612 - re-designed to: (1) use dbo.rangeAB - Alan Burstein
****************************************************************************************/
RETURNS TABLE WITH SCHEMABINDING AS RETURN
SELECT
position = r.RN,
token = SUBSTRING(@string, CHECKSUM(r.RN), @N)
FROM dbo.rangeAB(1, LEN(@string)+1-@N,1,1) AS r
WHERE @N > 0 AND @N <= LEN(@string);
GO
CREATE FUNCTION dbo.patExtract8K
(
@string VARCHAR(8000),
@pattern VARCHAR(50)
)
/*****************************************************************************************
[Description]:
This can be considered a T-SQL inline table valued function (iTVF) equivalent of
Microsoft's mdq.RegexExtract except:
1. It includes each matching substring's position in the string
2. It accepts varchar(8000) instead of nvarchar(4000) for the input string, varchar(50)
instead of nvarchar(4000) for the pattern
3. The mask parameter is not required and therefore does not exist.
4. You have specify what text we're searching for as an exclusion; e.g. for numeric
characters you should search for '[^0-9]' instead of '[0-9]'.
5. There is is no parameter for naming a "capture group". Using the variable below, both
the following queries will return the same result:
DECLARE @string nvarchar(4000) = N'123 Main Street';
SELECT item FROM dbo.patExtract8K(@string, '[^0-9]');
SELECT clr.RegexExtract(@string, N'(?<number>(\d+))(?<street>(.*))', N'number', 1);
Alternatively, you can think of patExtract8K as Chris Morris' PatternSplitCM (found here:
http://www.sqlservercentral.com/articles/String+Manipulation/94365/) but only returns the
rows where [matched]=0. The key benefit of is that it performs substantially better
because you are only returning the number of rows required instead of returning twice as
many rows then filtering out half of them. Furthermore, because we're
The following two sets of queries return the same result:
DECLARE @string varchar(100) = 'xx123xx555xx999';
BEGIN
-- QUERY #1
-- patExtract8K
SELECT ps.itemNumber, ps.item
FROM dbo.patExtract8K(@string, '[^0-9]') ps;
-- patternSplitCM
SELECT itemNumber = row_number() over (order by ps.itemNumber), ps.item
FROM dbo.patternSplitCM(@string, '[^0-9]') ps
WHERE [matched] = 0;
-- QUERY #2
SELECT ps.itemNumber, ps.item
FROM dbo.patExtract8K(@string, '[0-9]') ps;
SELECT itemNumber = row_number() over (order by itemNumber), item
FROM dbo.patternSplitCM(@string, '[0-9]')
WHERE [matched] = 0;
END;
[Compatibility]:
SQL Server 2008+
[Syntax]:
--===== Autonomous
SELECT pe.ItemNumber, pe.ItemIndex, pe.ItemLength, pe.Item
FROM dbo.patExtract8K(@string,@pattern) pe;
--===== Against a table using APPLY
SELECT t.someString, pe.ItemIndex, pe.ItemLength, pe.Item
FROM dbo.SomeTable t
CROSS APPLY dbo.patExtract8K(t.someString, @pattern) pe;
[Parameters]:
@string = varchar(8000); the input string
@searchString = varchar(50); pattern to search for
[Returns]:
itemNumber = bigint; the instance or ordinal position of the matched substring
itemIndex = bigint; the location of the matched substring inside the input string
itemLength = int; the length of the matched substring
item = varchar(8000); the returned text
[Developer Notes]:
1. Requires NGrams8k
2. patExtract8K does not return any rows on NULL or empty strings. Consider using
OUTER APPLY or append the function with the code below to force the function to return
a row on emply or NULL inputs:
UNION ALL SELECT 1, 0, NULL, @string WHERE nullif(@string,'') IS NULL;
3. patExtract8K is not case sensitive; use a case sensitive collation for
case-sensitive comparisons
4. patExtract8K is deterministic. For more about deterministic functions see:
https://msdn.microsoft.com/en-us/library/ms178091.aspx
5. patExtract8K performs substantially better with a parallel execution plan, often
2-3 times faster. For queries that leverage patextract8K that are not getting a
parallel exeution plan you should consider performance testing using Traceflag 8649
in Development environments and Adam Machanic's make_parallel in production.
[Examples]:
--===== (1) Basic extact all groups of numbers:
WITH temp(id, txt) as
(
SELECT * FROM (values
(1, 'hello 123 fff 1234567 and today;""o999999999 tester 44444444444444 done'),
(2, 'syat 123 ff tyui( 1234567 and today 999999999 tester 777777 done'),
(3, '&**OOOOO=+ + + // ==?76543// and today !!222222\\\tester{}))22222444 done'))t(x,xx)
)
SELECT
[temp.id] = t.id,
pe.itemNumber,
pe.itemIndex,
pe.itemLength,
pe.item
FROM temp AS t
CROSS APPLY dbo.patExtract8K(t.txt, '[^0-9]') AS pe;
-----------------------------------------------------------------------------------------
Revision History:
Rev 00 - 20170801 - Initial Development - Alan Burstein
Rev 01 - 20180619 - Complete re-write - Alan Burstein
*****************************************************************************************/
RETURNS TABLE WITH SCHEMABINDING AS RETURN
SELECT itemNumber = ROW_NUMBER() OVER (ORDER BY f.position),
itemIndex = f.position,
itemLength = itemLen.l,
item = SUBSTRING(f.token, 1, itemLen.l)
FROM
(
SELECT ng.position, SUBSTRING(@string,ng.position,DATALENGTH(@string))
FROM dbo.NGrams8k(@string, 1) AS ng
WHERE PATINDEX(@pattern, ng.token) < --<< this token does NOT match the pattern
ABS(SIGN(ng.position-1)-1) + --<< are you the first row? OR
PATINDEX(@pattern,SUBSTRING(@string,ng.position-1,1)) --<< always 0 for 1st row
) AS f(position, token)
CROSS APPLY (VALUES(ISNULL(NULLIF(PATINDEX('%'+@pattern+'%',f.token),0),
DATALENGTH(@string)+2-f.position)-1)) AS itemLen(l);
GO