How to remove strings and special characters from string and show only numbers without comma using regex?

In My case I am using react native typescript, I want to get only numbers from group string without comma. How to get it using regex match or replace?

 taskname = TASK_XC0.0.0.0.89t_abc_test let task = taskname.match( /[0-9]+/g, ''); //0,0,0,0,89 

Actual output need to get 000089