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Generic Syntax for URI (RFC 3986) — URI Characters

Section 2

pct-encoded =
"%"  HEXDIG  HEXDIG
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unreserved =
ALPHA /  DIGIT /  "-" /  "." /  "_" /  "~"
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reserved =
gen‑delims /  sub‑delims
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gen-delims =
":" /  "/" /  "?" /  "#" /  "[" /  "]" /  "@"
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sub-delims =
"!" /  "$" /  "&" /  "'" /  "(" /  ")" /  "*" /  "+" /  "," /  ";" /  "="
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