updated EBNF and test parse program which can be run as follows (enclose pURL in {})

python3 test.py {pkg:npm/foobar@12.3.1\?Faaaa\=aaaa}

which emits the following parse tree (in xml)

<?xml version="1.0" encoding="UTF-8"?><purl><scheme-component><TOKEN>pkg</TOKEN><TOKEN>:</TOKEN></scheme-component><type-component><ALPHA><TOKEN>n</TOKEN></ALPHA><ALPHA><TOKEN>p</TOKEN></ALPHA><ALPHA><TOKEN>m</TOKEN></ALPHA><TOKEN>/</TOKEN></type-component><name-component><name-segment><ALPHA><TOKEN>f</TOKEN></ALPHA><ALPHA><TOKEN>o</TOKEN></ALPHA><ALPHA><TOKEN>o</TOKEN></ALPHA><ALPHA><TOKEN>b</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>r</TOKEN></ALPHA></name-segment></name-component><version-component><TOKEN>@</TOKEN><version><DIGIT><TOKEN>1</TOKEN></DIGIT><DIGIT><TOKEN>2</TOKEN></DIGIT><safe><TOKEN>.</TOKEN></safe><DIGIT><TOKEN>3</TOKEN></DIGIT><safe><TOKEN>.</TOKEN></safe><DIGIT><TOKEN>1</TOKEN></DIGIT></version></version-component><qualifier-component><TOKEN>?</TOKEN><qualifier><key><ALPHA><TOKEN>F</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA></key><TOKEN>=</TOKEN><value><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA><ALPHA><TOKEN>a</TOKEN></ALPHA></value></qualifier></qualifier-component></purl>

still not quite right but a little better ...

To generate test parser:

goto https://www.bottlecaps.de/rex/
use these configure values= -tree -python -main
supply test ebnf

Note - The invoke escape the ? and = chars with \

Define EBNF in specification #363

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