Solved

Oracle 11g REGEXP_SUBSTR question

Posted on 2011-02-16
5
1,599 Views
Last Modified: 2012-08-13
I have a field (varchar2 type) in oracle table with sample contents:
f1
---
33345
223
230.0
234 567
abc345
34902,345
2
Country of
3345-45

I want an O/P:
33345
223
230
234
NULL -- For abc345
34902
2
NULL -- Country of
3345


-----
So I want to extract the first numeric part of the string (of any length) . If the string does not start with number (0-9), return null. I tried with REGEXP_SUBSTR('my string', ....) --- need some help.
0
Comment
Question by:toooki
  • 2
  • 2
5 Comments
 
LVL 22

Expert Comment

by:Ivo Stoykov
ID: 34913882
Hi this the code below. table in mine select is named t

HTH

Ivo Stoykov
select f1, case when regexp_like(f1, '[a-zA-Z]') then null else f1 end case from t t

Open in new window

0
 
LVL 74

Accepted Solution

by:
sdstuber earned 450 total points
ID: 34915416
regexp_substr(f1,'^[0-9]+')
0
 

Author Comment

by:toooki
ID: 34919629
Thank you all. I am checking.
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 34921329
 34913882 doesn't produce the requested results

here's the test case I used


WITH yourtable
     AS (SELECT '33345' f1 FROM DUAL
         UNION ALL
         SELECT '223' FROM DUAL
         UNION ALL
         SELECT '230.0' FROM DUAL
         UNION ALL
         SELECT '234 567' FROM DUAL
         UNION ALL
         SELECT 'abc345' FROM DUAL
         UNION ALL
         SELECT '34902,345' FROM DUAL
         UNION ALL
         SELECT '2' FROM DUAL
         UNION ALL
         SELECT 'Country of' FROM DUAL
         UNION ALL
         SELECT '3345-45' FROM DUAL)
SELECT f1,
       CASE WHEN REGEXP_LIKE(f1, '[a-zA-Z]') THEN NULL ELSE f1 END bad,
       REGEXP_SUBSTR(f1, '^[0-9]+') good
  FROM yourtable
0
 

Author Comment

by:toooki
ID: 34922363
Thanks a lot. regexp_substr(f1,'^[0-9]+')  worked perfectly.
Thanks everyone.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This article describes some very basic things about SQL Server filegroups.
As technology users and professionals, we’re always learning. Our universal interest in advancing our knowledge of the trade is unmatched by most industries. It’s a curiosity that makes sense, given the climate of change. Within that, there lies a…
This video shows syntax for various backup options while discussing how the different basic backup types work.  It explains how to take full backups, incremental level 0 backups, incremental level 1 backups in both differential and cumulative mode a…
This video shows how to copy an entire tablespace from one database to another database using Transportable Tablespace functionality.

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question