regex - Regexp to grab protocol from URL -

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let's have variable called url , it's assigned value of http://www.google.com. can received url via ftp, hence it'll ftp://ftp.google.com. how can have grab before :? i'll have if/else condition afterwards test logic.

/^[^:]+/

if want prevent 'www.foobar.com' (which has no protocol specified) match protocol:

/^[^:]+(?=:\/\/)/

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