Get number from string

Question

Hi,
I have a problem with an select.
I need to compare two string columns. First column includes only a number with 9 characters:
'001234567'
Second column includes text where somewhere inside this text is the number 001234567.
'Hallo1 001234567'
I need to extract the 9 character big number out of the string. I thought using the regular expression feature could help me.
SELECT
  REPLACE(REGEXP_REPLACE('hallo 001122334', '[a-z]', ''),' ') "REGEXP_REPLACE"
FROM dual;But this would exclude the number 1 after Hallo:
Result: '1001234567'
The number I look for is always 9 character long.
Thanks ahead,
Tobias

Answer 1

You have many variants:
with your_table as
     (select
            'hallo1001122334' first_column,
            '001122334' second_column
      from dual
select *
from your_table
where
--1) regexp_like(first_column,'.*'||second_column||'$')
--2) first_column like '%'||second_column
--3) regexp_substr(first_column,'\d{9}$')=second_column
--4) regexp_replace(first_column,'\D','') like '%'||second_columnFourth variant - includes case when chars can be between numbers in first column (for example 'hallo100a1a1a2a2a3a3a4').