Help - REGEXP: ignore zeros when it is followed by letters

Hello

I have a database with the data entered is wrong.
Ex: 1NC_P51234, 1NC_P01234, 1NC_P0001234

Is it possible to do a query: SELECT * from table where name like '% 1NC_P51234' and resulting:

1NC_P51234
1NC_P01234
1NC_P0001234

Basiccly YES, after the undercore and the letter P, ignoring the zero

Thanks in advance,

Roseline, Montreal, Quebec, Canada

Published by: Katie on October 26, 2009 08:14

Hi, Roseline,.

I think I understand now. Examples of great help, and done the formatting.

Let's rewrite the existing query, to make it more clear what he does:

SELECT  *
FROM    table_x
WHERE   REGEXP_LIKE ( name
                    , '_P'     ||     -- (a) the characters '_' and 'P', followed by
                '0*'     ||     -- (b) 0 or more '0's                  , followed by
                '[1-9]'     ||     -- (c) any of the characters '1' througn '9'
              )
;

That may have worked perfectly for your orriginal problem, but now you have a slightly different problem.
Before the optional '0', now you can get the 5 string '06 M - P' nstead of the string 2 "_P". You can simply change the part (a).
After the '0' option, you must now find the character '2' instead of characters 'by 9' 1. You can simply change the part (c), and you now have:

SELECT  *
FROM    table_x
WHERE   REGEXP_LIKE ( name
                    , '06M_P'     ||     -- (a) the characters '0', '6', 'M', '_' and 'P', followed by
                '0*'     ||     -- (b) 0 or more '0's, followed by
                '2'     ||     -- (c) the character '2'
              )
;

Again another time, condition (a) can be '09R_P' and condition (c) could be "600", in which case you could say:

SELECT  *
FROM    table_x
WHERE   REGEXP_LIKE ( name
                    , '09R_P'     ||     -- (a) the characters '09R_P', followed by
                '0*'     ||     -- (b) 0 or more '0's, followed by
                '600'     ||     -- (c) the characters '600'
              )
;

Actually, all of the queries above work exactly as written. The 2nd argument of REGEXP_LIKE can be any kind of expression.
It can be a single literal string, like

'_P0*[1-9]'

or it can be a concatenation of string literals 3, as

'09R_P' || '0*' || '600'

or it can be a concatenation of literals and bind variables, as

:part_a || 'P_0*' || :part_c

or it can be a concatenation of any kinds of string expressions, including
literals,.
bind variables,
columns,
SUBSTR,
CASE expressions,
even other regular expressions.

Tags: Database

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Help - REGEXP: ignore zeros when it is followed by letters

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