Writing Regular expression

Question

Hi All,
I want to use the regular expression for the following statement, So how should I write that.
If any string that is of letter (mr,Mr,mr.,Mr.,Mr .,mr .) should be trated as Male or M. Like wise for female also.
DECODE(title,'MR','M','MR.','M','MISS','F','MRS','F','MRS.','F','MS.','F','Unknown') AS male_femalePlease can anyone help to write the REG EXP?
thanks.

Answer 1

Hi Sid,
Assuming 'Mr .' is OK but 'Mr ' is not, you can use
with t as (
select 'MR' as title from dual union all
select 'Mr.' as title from dual union all
select 'Mr .' as title from dual union all
select 'Mr ' as title from dual union all
select 'MISS' as title from dual union all
select 'MRS' as title from dual union all
select 'MRS.' as title from dual union all
select 'ms.' as title from dual union all
select 'MISSTAKE' as title from dual
select
  title
, case
    when regexp_like(title,'^MR( \.|\.?)$','i') then 'M'
    when regexp_like(title,'^(MISS|MRS\.?|MS.)$','i') then 'F'
    else 'Unknown'
  end as Male_Female
from t
TITLE    MALE_FEMALE
MR       M          
Mr.      M          
Mr .     M          
Mr       Unknown    
MISS     F          
MRS      F          
MRS.     F          
ms.      F          
MISSTAKE Unknown     Regards,
Bob