Исходя из отправленных вами образцов данных, это очень простая проблема, если число, которое вы извлекаете:
Восьмизначная длина
Появляется в конце скобки
Если это так, вам просто нужна копия NGrams8K , и вы можете решить эту проблему в 3 строках кода:
-- your sample data
DECLARE @string VARCHAR(8000) = 'if ((DateTime.Parse("[ST 35401900]") < DateTime.Parse("[ST 35401903]")) and [35401900]=0 and [35401903]=3, 1, 0)';
-- purely set-based solution using NGrams8K
SELECT ng.position, result = SUBSTRING(ng.token,1,8)
FROM samd.NGrams8k(@string,9) AS ng
WHERE CHARINDEX(']',ng.token,8) = 9;
Возвращает:
position result
---------- --------
26 35401900
60 35401903
78 35401900
95 35401903
Я знаю, что вам не нужно знать, где эти числа находятся в строке, но я все равно включил их, чтобы продемонстрировать, насколько это легко, если вам нужно.
ОБНОВЛЕНО 22.01.2009 (США) на основе вопросов в комментариях ниже
Для обработки случаев, когда извлекаемое вами число равно , а не , всегда одинаковой длины, вы можете использовать мою функцию patextract8k (которая использует NGrams8K ):
CREATE FUNCTION samd.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 samd.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.
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 samd.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 samd.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 samd.patExtract8K(@string,@pattern) pe;
--===== Against a table using APPLY
SELECT t.someString, pe.ItemIndex, pe.ItemLength, pe.Item
FROM samd.SomeTable t
CROSS APPLY samd.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 samd.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 samd.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);
Используя PatExtract8K, вы можете легко указать диапазон размеров. Например, допустим, значения могут быть длиной от 7 до 9 цифр. Вы могли бы сделать это:
-- your sample data
DECLARE @string VARCHAR(8000) = 'if ((DateTime.Parse("[ST 123456789]") < DateTime.Parse("[ST 35401903]")) and [35401900]=0 and [35401903]=3 and [ST 1234567]=x, 1, 0)';
-- Lower and upper bounds for the length of valid values
DECLARE @low INT = 7, @high INT = 9
SELECT
itemIndex = s.itemIndex,
itemLength = s.itemLength-1,
item = SUBSTRING(s.item,0,s.itemLength)
FROM samd.patExtract8K(REPLACE(@string,']',CHAR(1)),'[^0-9'+CHAR(1)+']') AS s
WHERE s.itemLength BETWEEN @low AND @high+1;
--AND SUBSTRING(s.item,0,s.itemLength) NOT LIKE '[^0-9]' <<< If required
Returns
itemIndex itemLength item
----------- ----------- ------------
26 9 123456789
61 8 35401903
79 8 35401900
96 8 35401903
116 7 1234567
Пара замечаний:
Я обновил пример данных, чтобы включить значения длиной 7-9 цифр
Вы должны изменить схему кода на dbo (против samd) или создать схему с именем samd, чтобы использовать эту функцию.