Resolved: How to retrieve number from string between "o=" and "&" characters in Ecxel?

Question:

I was surfing the net, looking for a solution on how to retrieve the number that I need from a string in Excel. So I have this kinda string:

"somecharacterso=3242&morecharacters"

and I am trying to retrieve the “3242” number according to this https://www.ablebits.com/office-addins-blog/excel-regex-formulas/#functions
and stuck with this RegExp: o=\b(\d+)\b& but it extracts the full substring not the number only.

So, now tested and improved:
EDIT: based on comment to use “o=” and “&”:

=MID(A1,FIND("o=",A1,1)+2,(FIND("&",A1,1)-FIND("o=",A1,1)-2))*1

Does exactly as asked.

=mid(A1,find("=",A1,1)+1,find("&",A1,1)-(find("=",A1,1)+1))*1

returns the 3242 as a number.

If you have better answer, please add a comment about this, thank you!