Parse username from server response

Hi,

I´m trying to parse a username from a response that I´m receiving from a external server.

The complete response from the server·

HTTP/1.1 200 OK  Cache-Control: private  Content-Type: application/json; charset=utf-8  Server: Microsoft-IIS/10.0  X-AspNet-Version: 4.0.30319  X-Powered-By: ASP.NET  Date: Mon, 25 May 2020 10:18:21 GMT  Content-Length: 47    {"pid":"asdf001","mobileNumber":"+12345678909"}

I´m using "findstr" to search for the username.

set parse_user [findstr $recv_data "pid" 5 ","]
log local0. " status ---->>>$parse_user"

The log local0. looks this

"asdf001"

My question is, how do I remove the quotes on both sides of the username?

Thanks in advance.