René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Make browser version, os, and os version always optional.","articleBody":"Here are a few cases that work:\n\n```\n$ browserstack launch safari http://google.com\nLaunched job 2770009.\n$ browserstack launch safari:6 http://google.com\nLaunched job 2770010.\n$ browserstack launch safari:6.0 --os \"OS X:Lion\" http://google.com\nLaunched job 2770028.\n```\n\nHere are a few that don't:\n\n```\n$ browserstack launch safari:6 --os \"OS X\" http://google.com\nValidation Failed - `os_version` can't be blank, `os_version` invalid\n$ browserstack launch safari:6 --os \"OS X:Lion\" http://google.com\nValidation Failed - `browser_version` invalid\n```\n\nThis functionality will depend on logic in [browseroverflow](https://github.com/airportyh/browseroverflow) to [intelligently select a browser](https://github.com/airportyh/browseroverflow/blob/master/lib/select_browser.js) based on the supplied spec.\n","author":{"url":"https://github.com/airportyh","@type":"Person","name":"airportyh"},"datePublished":"2013-08-14T01:33:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/19/browserstack-cli/issues/19"}