RFC 3986

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http://www.ietf.org/rfc/rfc3986.txt

Unreserved Characters

Characters that are allowed in a URI but do not have a reserved
purpose are called unreserved.  These include uppercase and lowercase
letters, decimal digits, hyphen, period, underscore, and tilde.

unreserved  = ALPHA / DIGIT / "-" / "." / "_" / "~"