git ssb

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range-set  ::= range ( logical-or range ) *
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logical-or ::= ( ' ' ) * '||' ( ' ' ) *
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range      ::= hyphen | simple ( ' ' simple ) * | ''
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hyphen     ::= partial ' - ' partial
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simple     ::= primitive | partial | tilde | caret
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primitive  ::= ( '<' | '>' | '>=' | '<=' | '=' ) partial
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partial    ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
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xr         ::= 'x' | 'X' | '*' | nr
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nr         ::= '0' | [1-9] ( [0-9] ) *
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tilde      ::= '~' partial
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caret      ::= '^' partial
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qualifier  ::= ( '-' pre )? ( '+' build )?
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pre        ::= parts
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build      ::= parts
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parts      ::= part ( '.' part ) *
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part       ::= nr | [-0-9A-Za-z]+
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