Replace,translate or REGEXP_REPLACE

Question

I want to remove the first character of the string that contains '~'
something like below,
FROM :    ~12STRING~ABC~SOMETHING~
     TO :   12STRING~ABC~SOMETHING~How do i do that, replace,translate, REGEXP_REPLACE
Please advise.
Billu

Answer 1

The following is slightly more performant because it doesn't have to capture (.*) and substitue (\1)It is best to provide proof when making statements that one method is better than another.
Like this;
create table source_data as (
   select ' ~12STRING~ABC~SOMETHING~' c
   from dual
   connect by rownum <= 100000);
Table created
set timing on
create table your_regexp as (
   select regexp_replace(c, '^ ?~') c
   from source_data);
Table created
Executed in 0.703 seconds
create table my_regexp as (
   select regexp_replace(c, '^ ?~(.*)', '\1') c
   from source_data);
Table created
Executed in 1.484 secondsIt seems that you are correct. The timings differ by approx 0.1 seconds when the order of the statements is reversed.