Splitting of string by fixed keyword - sql

Question

Hi I currently have a tables with a column that I would like to split.
ID Serial
1 AAA"-A01-AU-234-U_xyz(CY)(REV-002)
2 AAA"-A01-AU-234-U(CY)(REV-1)
3 AAA"-A01-AU-234-U(CY)(REV-101)
4 VVV"-01-AU-234-Z_ww(REV-001)
5 VVV"-01-AU-234-Z(REV-001)_xyz(CY)
6 V-VV"-01-AU-234-Z(REV-03)_xyz(CY)
7 V-VV"-01-AU-234-Z-ZZZ(REV-004)_xyz(CY)
I would like to split this column into 2 field via a select statement
The first field would consist of the text from the start and end when this scenario is satisfied
After the first "-
take all text till the next 3 hypen (-)
Take the first letter after the last hypen(-)
The second field would want to store the Value(Int) inside the (REV) bracket. Rev is always stored inside a compassing bracket (Rev-xxx) the number may stretch from 0-999 and have different form of representation
Example of output
Field 1 Field 2
AAA"-A01-AU-234-U 2
AAA"-A01-AU-234-U 1
AAA"-A01-AU-234-U 101
VVV"-01-AU-234-Z 1
VVV"-01-AU-234-Z 1
V-VV"-01-AU-234-Z 3
V-VV"-01-AU-234-Z 4

Answer 1

Maybe it is possible to make it better and faster, but at least it does work. If i will have some time more i will look at this again to think of better solution, but it do the job.
create table #t
(
id int,
serial nvarchar(255)
)
go
insert into #t values (1, 'AAA"-A01-AU-234-U_xyz(CY)(REV-002)')
insert into #t values (2, 'AAA"-A01-AU-234-U(CY)(REV-1)')
insert into #t values (3, 'AAA"-A01-AU-234-U(CY)(REV-101)')
insert into #t values (4, 'VVV"-01-AU-234-Z_ww(REV-001)')
insert into #t values (5, 'VVV"-01-AU-234-Z(REV-001)_xyz(CY)')
insert into #t values (6, 'VVV"-01-AU-234-Z(REV-03)_xyz(CY)')
insert into #t values (7, 'VVV"-01-AU-234-Z(REV-004)_xyz(CY)')
go
select id, serial,
left(serial,charindex('-', serial, charindex('-', serial, charindex('-', serial, charindex('"',serial) + 2) +1) + 1) + 1) as 'Field2'
,cast( replace(left(right(serial, len(serial) - charindex('REV',serial) +1 ), CHARINDEX(')',right(serial, len(serial) - charindex('REV',serial) +1 )) - 1), 'REV-', '')as int) as 'Field1'
from #t
go
gives me:
id serial Field2 Field1
1 AAA"-A01-AU-234-U_xyz(CY)(REV-002) AAA"-A01-AU-234-U 2
2 AAA"-A01-AU-234-U(CY)(REV-1) AAA"-A01-AU-234-U 1
3 AAA"-A01-AU-234-U(CY)(REV-101) AAA"-A01-AU-234-U 101
4 VVV"-01-AU-234-Z_ww(REV-001) VVV"-01-AU-234-Z 1
5 VVV"-01-AU-234-Z(REV-001)_xyz(CY) VVV"-01-AU-234-Z 1
6 VVV"-01-AU-234-Z(REV-03)_xyz(CY) VVV"-01-AU-234-Z 3
7 VVV"-01-AU-234-Z(REV-004)_xyz(CY) VVV"-01-AU-234-Z 4

Answer 2

I came up with a solution in php using regular expressions.I am trying to convert it into posix standards supported by mysql.Anyways in the meanwhile you can have a look at this and it works perfect.
/The first script select the values for fields 1 namely AAA"-A01-AU-234-U/
<?php
$txt='VVV"-01-AU-234-Z(REV-001)_xyz(CY)';
$re1='((?:[a-z][a-z0-9_]*))';
$re2='.*?';
$re3='(\\d+)';
$re4='.*?';
$re5='((?:[a-z][a-z0-9_]*))';
$re6='.*?';
$re7='(\\d+)';
$re8='.*?';
$re9='([a-z])';
echo $re1.$re2.$re3.$re4.$re5.$re6.$re7.$re8.$re9;
if ($c=preg_match_all ("/".$re1.$re2.$re3.$re4.$re5.$re6.$re7.$re8.$re9."/is", $txt, $matches))
{
$var1=$matches[1][0];
$int1=$matches[2][0];
$var2=$matches[3][0];
$int2=$matches[4][0];
$w1=$matches[5][0];
print "($var1) ($int1) ($var2) ($int2) ($w1) \n";
}
?>
/*The second script selects values for field 2 namely the last integer*/
<?php
$txt='VVV"-01-AU-234-Z_ww(REV-001)';
$re1='.*?';
$re2='\\d';
$re3='.*?';
$re4='\\d';
$re5='.*?';
$re6='\\d';
$re7='.*?';
$re8='\\d';
$re9='.*?';
$re10='\\d';
$re11='.*?';
$re12='\\d';
$re13='.*?';
$re14='\\d';
$re15='(\\d)';
if ($c=preg_match_all ("/".$re1.$re2.$re3.$re4.$re5.$re6.$re7.$re8.$re9.$re10.$re11.$re12.$re13.$re14.$re15."/is", $txt, $matches))
{
$d1=$matches[1][0];
print "($d1) \n";
}
?>
OUTPUT:
(VVV) (01) (AU) (234) (Z) //script 1
(1) //script 2
You can add database connection to the script and store the results in a new table.You can aslo iterate each row as input to the script and store corresponding results in the table.
Note:
The regular expression used for selecting field 1:
((?:[a-z][a-z0-9_]*)).*?(\d+).*?((?:[a-z][a-z0-9_]*)).*?(\d+).*?([a-z])
The regular expression used for selecting field 2:
.*?\d.*?\d.*?\d.*?\d.*?\d.*?\d.*?\d(\d)
If anybody can convert the above expressions to posix standards then the user can write a simple query like
select t.serial as field 1 from table t
where t.serial regexp 'converted exp' join
(select t1.serial as field 2 from table t1
where t1.serial regexp 'converted exp')q
on q.id=t.id;
I tried to convert it but the matching constraints were lost.You should actually change ?: to ^ and ? to [^>] and //d to [0-9] or digit.Hope it helps.

Answer 3

Try this solution. It uses a combination of charindex and the substring function.
DECLARE #TempTable table
(
id int,
serial nvarchar(255)
)
insert into #TempTable values (1, 'AAA"-A01-AU-234-U_xyz(CY)(REV-002)')
insert into #TempTable values (2, 'AAA"-A01-AU-234-U(CY)(REV-1)')
insert into #TempTable values (3, 'AAA"-A01-AU-234-U(CY)(REV-101)')
insert into #TempTable values (4, 'VVV"-01-AU-234-Z_ww(REV-001)')
insert into #TempTable values (5, 'VVV"-01-AU-234-Z(REV-001)_xyz(CY)')
insert into #TempTable values (6, 'VVV"-01-AU-234-Z(REV-03)_xyz(CY)')
insert into #TempTable values (7, 'VVV"-01-AU-234-Z(REV-004)_xyz(CY)')
select
id,
serial,
substring(serial, 1, P4.Pos+1) as field1,
convert(int, substring(Serial, P6.Pos , P7.Pos - P6.Pos)) as field2
from #TempTable
cross apply (select (charindex('-', Serial))) as P1(Pos)
cross apply (select (charindex('-', Serial, P1.Pos+1))) as P2(Pos)
cross apply (select (charindex('-', Serial, P2.Pos+1))) as P3(Pos)
cross apply (select (charindex('-', Serial, P3.Pos+1))) as P4(Pos)
cross apply (select (charindex('REV-', Serial,P1.Pos+1)+4)) as P6(Pos)
--+4 because 'REV-' is 4 chars long
cross apply (select (charindex(')', Serial,P6.Pos+1))) as P7(Pos);

Answer 4

I have updated my answer. Is this better now?
DECLARE #Table table(ID int, SERIAL nvarchar(100));
INSERT INTO #Table(ID, SERIAL)
VALUES ('1', 'AAA"-A01-AU-234-U_xyz(CY)(REV-002)'),
('2', 'AAA"-A01-AU-234-U(CY)(REV-1)'),
('3', 'AAA"-A01-AU-234-U(CY)(REV-101)'),
('4', 'VVV"-01-AU-234-Z_ww(REV-001)'),
('5', 'VVV"-01-AU-234-Z(REV-001)_xyz(CY)'),
('6', 'VVV"-01-AU-234-Z(REV-03)_xyz(CY)'),
('7', 'VVV"-01-AU-234-Z(REV-004)_xyz(CY)'),
('8', 'AAA"-A01-AU-234-U-1111-(REV-111)'),
('9', 'AAA"-A01-AU-234-U-111111-5555(CY)(REV-101)'),
('10', 'V-VV"-01-AU-234-Z-ZZZ(REV-004)_xyz(CY)')
SELECT
ID,
SERIAL,
LEFT(SERIAL, P5.Pos + 1) AS Field1,
CONVERT(int, SUBSTRING(SERIAL, P6.Pos, CHARINDEX(')', RIGHT(SERIAL, LEN(SERIAL) - P6.Pos)))) AS Field2
FROM #Table
CROSS APPLY (SELECT CHARINDEX('"-', SERIAL)) AS P1(Pos)
CROSS APPLY (SELECT CHARINDEX('-', SERIAL, P1.Pos + 1)) AS P2(Pos)
CROSS APPLY (SELECT CHARINDEX('-', SERIAL, P2.Pos + 1)) AS P3(Pos)
CROSS APPLY (SELECT CHARINDEX('-', SERIAL, P3.Pos + 1)) AS P4(Pos)
CROSS APPLY (SELECT CHARINDEX('-', SERIAL, P4.Pos + 1)) AS P5(Pos)
CROSS APPLY (SELECT CHARINDEX('REV-', SERIAL, P5.Pos + 1) + 4) AS P6(Pos)