exver 0.2.1

Semver extension with upstream and downstream versions. Designed for package distributors
Documentation 
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version_range = { version_range_atom ~ ( ( or | and )? ~ version_range_atom )* }
or = { "||" }
and = { "&&" }
version_range_atom = { ( "(" ~ version_range ~ ")" ) | anchor | not | any | none | flavor_atom  }
anchor = { cmp_op? ~ version_spec }
version_spec = @{ ("#" ~ flavor ~ ":")? ~ version ~ ( ":" ~ version )? }
not = { "!" ~ version_range_atom }
any = { "*" }
none = { "!" }
flavor_atom = @{ "#" ~ flavor }
cmp_op = { gte | lte | neq | eq | lt | gt | caret | tilde }
gte = { ">=" }
lte = { "<=" }
lt = { "<" }
neq = { "!=" }
eq = { "=" }
gt = { ">" }
caret = { "^" }
tilde = { "~" }
extended_version = @{ ( "#" ~ flavor ~ ":" )? ~ version ~ ":" ~ version }
version = @{ ( num ~ "." )* ~ num ~ ( "-" ~ prerelease )? }
flavor = @{ 'a'..'z'* }
num = @{ "0" | ( '1'..'9' ~ '0'..'9'* ) }
prerelease = @{ prerelease_seg ~ ("." ~ prerelease_seg)* }
prerelease_seg = @{ ( '0'..'9' | 'a'..'z' | 'A'..'Z' | "-" )+ }

WHITESPACE = _{ " " }