Regular Expression: Find number preceding a string

Hello,

I have a string column. I want to extract the 1-2 digit number preceding a specific format: 4X100. So basically, the desired value can be anywhere in the string:

Some text here 4X100 and some text here
16X160 Some text here
Some text here 2X90

How do I just extract just the number preceding the X? So in the first example, all I want is a 4.

Would something like this work?

SELECT Replace(REGEXP_SUBSTR('Some text here 4X100 and some text here', '[0-9]+X'), 'X', '') RESULT FROM DUAL;

Thanks!