Get appname from user-agent

I have strings like

VK/28 CFNetwork/711.4.6 Darwin/14.0.0
Mozilla/5.0 (iPhone; CPU iPhone OS 9_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13C75 Safari/601.1
Instagram 8.2.0 (iPhone4,1; iPhone OS 8_4; ru_RU; ru; scale=2.00; 640x960)    AppleWebKit/420+
Mozilla/5.0 (iPhone; CPU iPhone OS 9_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13C75 Safari/601.1

I want to know what is application were used to every string. It's

vk
mozilla
instagram
mozilla

I find the way to determine browser, but how get app I don't know.