Problem parsing certain agent strings

[doomspork]

We've run across a handful of user agents that don't parse well, all of the following are missing the OS values:

• Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36
• Mozilla/5.0 (Windows NT 6.1%3B Trident/7.0%3B SLCC2%3B .NET CLR 2.0.50727%3B .NET CLR 3.5.30729%3B .NET CLR 3.0.30729%3B Media Center PC 6.0%3B .NET4.0C%3B rv:11.0) like Gecko
• Mozilla/5.0 (Windows NT 6.1%3B WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
  Slackbot-LinkExpanding 1.0 (+https://api.slack.com/robots)
• Mozilla/5.0 (Macintosh%3B Intel Mac OS X) AppleWebKit/538.1 (KHTML, like Gecko) PhantomJS/2.1.1 Safari/538.1
• Mozilla/5.0 (Windows NT 6.1%3B WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36
• Mozilla/5.0 (Windows NT 6.1%3B WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36
• Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko Firefox/11.0 (via ggpht.com GoogleImageProxy)
• Mozilla/5.0 (Macintosh; Intel Mac OS X) Word/0.0.0
• Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; ms-office; MSOffice 15)
• Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko
• Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36
• Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Win64; x64; Trident/7.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3; ms-office; MSOffice 15)
• Mozilla/5.0 (Macintosh; Intel Mac OS X) AppleWebKit/538.1 (KHTML, like Gecko) PhantomJS/2.1.1 Safari/538.1
• Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
• Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; ms-office; MSOffice 16)

One in particular is missing both OS and browser version:

• Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko Firefox/11.0 (via ggpht.com GoogleImageProxy)

[doomspork]

After digging into this further the issue appears to be the pattern file. In the first case above we do parse the Operating System but per the pattern file the "family" is considered "Windows 7" whereas the version remains nil.