Regular Expression query

Question

We will have below data in one column
++77++
++34_
--9--
98
999
+00_
My requirement is to fetch only number from above data. please find output i want from each data
++77++ -> 77
++34_ -> 34
--9-- -> 9
98 -> 98
999      -> 999
+00_     -> 00
Please provide the query for the same.
Thanks

Answer 1

Works on 10g or higher:
with data as
  select '++77++' col from dual union all
  select '++34_' col from dual union all
  select '--9--' col from dual union all
  select '98' col from dual union all
  select '999' col from dual union all
  select '+00_' col from dual
select col, regexp_substr(col, '[[:digit:]]+') col
  from data;
COL    COL   
++77++ 77    
++34_  34    
--9--  9     
98     98    
999    999   
+00_   00