How to replace unwanted items in a string with blank in stylesheet

JSESSIONID=655885676C46C0A9A00EDSRFA764016643FD; Path=/; Expires=Fri, 28-Nov-2014 16:42:52 GMT; HttpOnly; USER_ID=rC4tHFvd+DRcSRsk1jAsfd7Ag--; Expires=Wed, 27-May-2015 04:42:53 GMT; Path=/; USER_CONFIRM=47ead7afca94f5d5f8sera40e67f59fe526; Expires=Wed, 27-May-2015 04:42:53 GMT; Path=/; RCC_COOKIE=1417149773308/131490892; Path=/; CODE=bs8RT$Sxr1jrI+efnVq4pIV6CQ--; Path=/; Secure; Expires=Mon, 11-Apr-2016 04:42:53 GMT; Path=/; SC=""; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/;SYN_COOKIE=x%2FWhJoldsfdgfrwRn227tbcNKKtCSjsAc7EYvvvSQPL1ou%2B0pLGmndZtzpb5cWrLKmSuWtAz4BJgB2RLGVnW%0Agm2u88liSw%3D%3D; Expires=Wed, 27-May-2015 04:42:53 GMT; Path=/; RCC_COOKIE=1417149773755/131490892; Path=/; SYN_COOKIE=x%2FWhJowRn227tbcNKKtCSjo0xOS1STGF6m63ovQlPDhbCh%2BmndZtzpb5cWrLKmSuWtAz4BJgB2RLGVnW%0Agm2u88liSw%3D%3D; Expires=Wed, 27-May-2015 04:42:53 GMT; Path=/;RCC_COOKIE=1417149774517/131490892; Path=/

This I'm extracting to a variable in style sheet

How to use regexp to remove Path, Expires , etc and other values whatever I wish

Like I just want to send only JSESSIONID, SYN_COOKIE, RCC_COOKIE, CODE. So I need to extract them only from this.