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In response to
"Uh? Like old school barely recognizable limited characters commands? Like if one programmed using only the Vic 20 symbolic shortcuts?"
by
JD
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It's used thousands of times a day inside dozens of programming languages and applications, including SlackerTalk -- (edited)
Posted by
Beryllium (aka grayman)
Jun 25 '17, 17:47
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The matching part in particular is useful for detecting when link embedding may be possible, like so:
#^https?://[^/]*\.?twitter\.com/status/.*$#
Edit: I think I got most of the syntax right. It basically says, accept strings that start with http, then an optional "s", then the normal :// part, then anything as the subdomain (the * means 0 to infinity, and the [^/] means, as long as the character is not a "/"), then twitter.com/status/ (the dot after twitter is escaped because normally it's a wildcard character), the unescaped .*$ means "any character repeating until the end of the string".
If this gets run against a twitter post URL, it'll return "true"; any other URL would return false, and that's how the code knows it's a twitter post.
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