PL/SQL :: Extract Numbers Only

Here i face probelm that he numbers must be follw by DOT "." , this is not correct if the statment only conatines numbers without DOT that not extract. As the

SELECT REGEXP_SUBSTR ( 'hello to 8898989898989 jkjk nnnm mnj'
, '([0-9]+.[0-9]*)' || -- Starts with digit(s) (may or may not have digits after .)
'|' || -- or
'(.[0-9]+)' -- starts with decimal point
) AS result
FROM dual
;

but mean i have to add . after numbers . as follow

SELECT REGEXP_SUBSTR ( 'hello to 8898989898989 jkjk nnnm mnj'
, '([0-9]+.[0-9]*)' || -- Starts with digit(s) (may or may not have digits after .)
'|' || -- or
'(.[0-9]+)' -- starts with decimal point
) AS result
FROM dual
;

but this is not right

i want to extract numbers without DOT also.