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added 34 characters in body

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edited Aug 29, 2018 at 12:30

JavaScript (Node.js), 131131 128 bytes

s=>unescape(s.replace(r=/B.(D.)?/g,(f,s)=>(-~g(f[1])*4*!!s+g((s||f)[1])).toString(16),g=c=>'IAOU'.indexOfsearch(c)).replace(/../g,'%$&'))

Try it online!Try it online! Link includes test cases. Alternative version, also 131 bytes:

s=>unescape(s.replace(r=/B.(D.)?/g,s=>(-~g(s[1])*4*!!s[3]+g(s[3]||s[1])).toString(16),g=c=>'IAOU'.indexOfsearch(c)).replace(/../g,'%$&'))

Try it online!Try it online! Link includes test cases. Edit: Saves 3 bytes thanks to @Shaggy.

s=>unescape(s.replace(r=/B.(D.)?/g,(f,s)=>(-~g(f[1])*4*!!s+g((s||f)[1])).toString(16),g=c=>'IAOU'.indexOf(c)).replace(/../g,'%$&'))

Try it online! Link includes test cases. Alternative version, also 131 bytes:

s=>unescape(s.replace(r=/B.(D.)?/g,s=>(-~g(s[1])*4*!!s[3]+g(s[3]||s[1])).toString(16),g=c=>'IAOU'.indexOf(c)).replace(/../g,'%$&'))

Try it online! Link includes test cases.

s=>unescape(s.replace(/B.(D.)?/g,(f,s)=>(-~g(f[1])*4*!!s+g((s||f)[1])).toString(16),g=c=>'IAOU'.search(c)).replace(/../g,'%$&'))

Try it online! Link includes test cases. Alternative version, also 131 bytes:

s=>unescape(s.replace(/B.(D.)?/g,s=>(-~g(s[1])*4*!!s[3]+g(s[3]||s[1])).toString(16),g=c=>'IAOU'.search(c)).replace(/../g,'%$&'))

Try it online! Link includes test cases. Edit: Saves 3 bytes thanks to @Shaggy.

Source Link

created Aug 29, 2018 at 9:39

s=>unescape(s.replace(r=/B.(D.)?/g,(f,s)=>(-~g(f[1])*4*!!s+g((s||f)[1])).toString(16),g=c=>'IAOU'.indexOf(c)).replace(/../g,'%$&'))

Try it online! Link includes test cases. Alternative version, also 131 bytes:

s=>unescape(s.replace(r=/B.(D.)?/g,s=>(-~g(s[1])*4*!!s[3]+g(s[3]||s[1])).toString(16),g=c=>'IAOU'.indexOf(c)).replace(/../g,'%$&'))

Try it online! Link includes test cases.