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Oracle replace string question

Posted on 2014-01-21
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Last Modified: 2014-01-23
Could you please suggest how can I replace a string like the followings:

Something..bIgdOg..sMALlcaT..SomethingMore
Something..bIgdoG..sMaLlcaT..SomethingMore
Something..bIGDog..smaLLcat..SomethingMore


with the following:
Something..BigDog..SmallCat..SomethingMore

Using a oracle select statement with regex_replace or replace queries that is small (readable)? The input string has random upper and lower cases for the words BigDog and SmallCat.

Thank you.
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Comment
Question by:toooki
6 Comments
 
LVL 23

Expert Comment

by:Steve Wales
ID: 39798976
There is a builtin function called INITCAP that will capitalize each word:

SQL> select initcap('SmallCAT..BigDog') from dual;

INITCAP('SMALLCA
----------------
Smallcat..Bigdog

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That's great and all, but what rule would you use to set the capital in the middle of the word since that's kinda arbitrary given the examples above
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Author Comment

by:toooki
ID: 39798983
Thank you. But I cannot change the rest of the string (Something and SomethingMore and these contents are unknown. So Initcap will not work well.

I could repeatedly use the replace statement for all combination of the SmallCAT and BigDog strings with cap/small letter mix but that will look the query unreadable.
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LVL 74

Accepted Solution

by:
sdstuber earned 2000 total points
ID: 39799078
select
     regexp_replace(
          regexp_replace(yourcolumn,'[bB][iI][gG][dD][oO][gG]','BigDog'),
          '[sS][mM][aA][lL]{2}[cC][aA][tT]','SmallCat')
from yourtable

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or, use case insensitive search...


select
      regexp_replace(
                   regexp_replace(yourcolumn,'bigdog','BigDog',1,0,'i'),
                   'smallcat','SmallCat',1,0,'i')
from yourtable

Open in new window

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LVL 32

Expert Comment

by:awking00
ID: 39800681
Without a means of identifying that a string is made up of separate words (i.e. separated by underscores or slashes or such), I don't think this can be accomplished. Except for the case, are the strings always the same or could something like rEaltInYMousE also exist?
0
 

Author Comment

by:toooki
ID: 39801883
Thank you!
The query
select
     regexp_replace(
          regexp_replace(yourcolumn,'[bB][iI][gG][dD][oO][gG]','BigDog'),
          '[sS][mM][aA][lL]{2}[cC][aA][tT]','SmallCat')
from yourtable
perfectly worked for me. Many thanks!
0
 
LVL 32

Expert Comment

by:awking00
ID: 39803014
So the part of the string that needs to be replaced is always the same (i.e. BigDog and SmallCat)?
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