[英]Sql regex query to match exact matches of the word
My query is 我的查询是
DECLARE @Values TABLE
(
value NVARCHAR(255)
)
INSERT INTO @Values VALUES('BWE');
INSERT INTO @Values VALUES('BWT');
INSERT INTO @Values VALUES('IMO I');
INSERT INTO @Values VALUES('IMO II');
INSERT INTO @Values VALUES('BWE-E');
INSERT INTO @Values VALUES('BWE-EP');
INSERT INTO @Values VALUES('IMO III');
INSERT INTO @Values VALUES('BWM-EP(s)');
INSERT INTO @Values VALUES('BWM-EP');
select * from @Values
SELECT a.value
FROM @Values a
INNER JOIN (SELECT 'BWM-EP(s)' AS CLASS_NOTATION) b
ON LTRIM(RTRIM(b.CLASS_NOTATION)) like '%[^a-z0-9]' + LTRIM(RTRIM(a.VALUE)) + '[^a-z0-9]%'
or LTRIM(RTRIM(b.CLASS_NOTATION)) like LTRIM(RTRIM(a.VALUE)) + '[^a-z0-9]%'
or LTRIM(RTRIM(b.CLASS_NOTATION)) like '%[^a-z0-9]' + LTRIM(RTRIM(a.VALUE))
or LTRIM(RTRIM(b.CLASS_NOTATION)) = LTRIM(RTRIM(a.VALUE))
It works in most of the cases of class notation . 它适用于大多数的类表示法。 but in this particular case when I have 'BWM-EP(s)' as class notation it gives you both BWM-EP(s) and BWM-EP .
但是在这种特殊情况下,当我使用“ BWM-EP”作为类符号时,它会同时为您提供BWM-EP和BWM-EP。 But result should be only BWM-EP(s) .
但是结果应该只是BWM-EP。 What is wrong ?
怎么了 ?
As I see from the answers even though the root cause for this problem is second OR condition . 从答案中可以看出,即使此问题的根本原因是第二个OR条件。 I cannot exclude that condition as i need that when the class notation is BWE BWT .
我不能排除该条件,因为当类标记为BWE BWT时,我需要这样做。 How can i overcome from this ?
我该如何克服呢?
It's the 这是
or LTRIM(RTRIM(b.CLASS_NOTATION)) like LTRIM(RTRIM(a.VALUE)) + '[^a-z0-9]%'
condition that matches the BWM-EP
value. 与
BWM-EP
值匹配的条件。
This makes sense; 这很有道理; this expression can be reduced to
'BMW-EP(s)' like 'BMW-EP'[^a-z0-9]%
for the BMW-EP
record, which is obviously true. 对于
BMW-EP
记录,此表达式可以减少为'BMW-EP(s)' like 'BMW-EP'[^a-z0-9]%
,这显然是正确的。
Here's how it works without that: http://www.sqlfiddle.com/#!3/e5251/6 没有它的工作原理如下: http : //www.sqlfiddle.com/#!3/e5251/6
Try this one - 试试这个-
DECLARE @Values TABLE (value NVARCHAR(255))
INSERT INTO @Values
VALUES
('BWE'),('BWT'),('IMO I'),('IMO II'),
('BWE-E'),('BWE-EP'),('IMO III'),
('BWM-EP(s)'),('BWM-EP')
SELECT value
FROM (
SELECT value = LTRIM(RTRIM(value))
FROM @Values
) a
CROSS JOIN (
SELECT note = LTRIM(RTRIM('BWM-EP(s)'))
) t
where note LIKE '%[^a-z0-9]' + value + '[^a-z0-9]%'
OR note LIKE '%[^a-z0-9]' + value
OR note = value
Output - 输出-
value
----------
BWM-EP(s)
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