set scan off
set feedback off

create table t ( c varchar2(25) );
insert into t values ( '144 EA MISC & 144 EA MISC' );
insert into t values ( '178mg/dl Fssv' );
insert into t values ( '11mg/dl Fssv' );
insert into t values ( '123mg/dl Fssv' );
insert into t values ( '3mg/dl Fssv' );
insert into t values ( '112 EA MISC & 1 EA MISC' );
insert into t values ( '234 EA MISC' );

column c_digits format a25

select c, regexp_substr( c, '[[:digit:]]+' ) c_digits from t ;

C                         C_DIGITS
------------------------- -------------------------
144 EA MISC & 144 EA MISC 144
178mg/dl Fssv             178
11mg/dl Fssv              11
123mg/dl Fssv             123
3mg/dl Fssv               3
112 EA MISC & 1 EA MISC   112
234 EA MISC               234