Using REGEXP_SUBSTR to get key-value pair data

I have a column with below values,

User_Id=446^User_Input=L307-60#/25" AP^^

I am trying to get each individual value based on a specified key.

1. All value after User_Id= until it encounters ^


2. All value after User_Input= until it encounters ^

I tried for and so far I have this,

SELECT  LTRIM(REGEXP_SUBSTR('User_Id=446^User_Input=L307-60#/25" AP^'
          ,'[0-9]+',1,1),'^') User_Id 
from dual

How do I get the value for the User_Input??

P.S: User input can have anything, like ',", *,% including a ^ in the middle of the string (that is, not as a delimiter).

Any help would be greatly appreciated..