Escaping parenthesis in regular expression

[DavidSho]

Hello everyone,
I am trying to extract text from the inside of parenthesis in a string.
For example: 
From this string :

Microsoft Office Excel/16.0.11929.20618 (Windows/10.0; Desktop x64; en-IE; Desktop app; Dell Inc./XPS 13 9370)

Extract only: (Windows/10.0; Desktop x64; en-IE; Desktop app; Dell Inc./XPS 13 9370)

I've tried this command in Log Analytics

| extend UserDevice = extract('\(.*\)', 0, UserAgent )
And got a Syntax Error
Iv'e usesd \ to escape special chracters: ( and  )

Anyone could assist?

[#2 · Accepted solution]

@DavidSho 

\ is a special character so you need two of them "\\", this wont error now, but gets all between the "(" and ")".   e.g. "(Windows/10.0; Desktop x64; en-IE; Desktop app; Dell Inc./XPS 13 9370)"

print t = "Microsoft Office Excel/16.0.11929.20618 (Windows/10.0; Desktop x64; en-IE; Desktop app; Dell Inc./XPS 13 9370)"
| extend UserDevice = extract('\\(.*\\)', 0, t )

[#3]

THANK YOU !!!