Jelly's code-page is equal to ASCII in the range
0x20, through to
0x7e, inclusive so the lack of any of
worldWORLD in the code above suffices (note:
ẇȯṘĿḊ are not
woRLD or equivalent bytes.)
Try it online!
This took a little fiddling to avoid the forbidden bytes:
all the naive string compressions contained illegal characters;
finding the first index of a sublist within another is performed with the
finding the length of a list (for chopping and measuring to replace
L - something I considered was summing the indices with
JS (triangle(9)=45), I ended up using a list of strings and a separate trailing period to kill three birds with one stone [sic], allowing a dequeue-flatten-dequeue chain,
ḊFḊ, to pick out the word
World, this can be further shortened by post-joining the list with the space using
Ḳ, allowing for a simple dequeue,
Ḋ to be used instead saving another byte.
Adding the trailing period to whichever response is output as a single action also allowed compression without illegal bytes.
For some reason, the word
yes is not in Jelly's dictionary, yet even though compressing
Ah, yes. is the same length as the raw string, having the compression as a list of strings
['Ah, yes.',' World'] (
“¢ƈṫ(Ɲ¬÷Ø“¥ḄḞ») is shorter by two bytes than concatenating (
“Ah, yes.”;“¥ḄḞ»), the third bird.
For the first message I compressed
Hell as a word and prepended the string '...' with an 'o' to avoid the forbidden bytes.
W: “¡Kịy<⁷ẊṘṘsṁñAỵḋẇ,ẇʂI» - compressed string "Hello... eh, whom should I greet?"
R: “¢ƈṫ(Ɲ¬÷Ø“¡ṣƓ» - compressed list of strings ["Ah, yes.","World"]
D: “TḲj/Ẇi¤cecṡĿt⁺ƘNƁ⁻» - compressed string "No. That isn't what I meant"
WṄøRµɠŒteḊȧKȯD;”. - Main link: no arguments
W - "Hello... eh, whom should I greet?"
Ṅ - print and yield
ø - niladic chain separation, no input to the following
R - ["Ah, yes.","World"]
µ - monadic chain separation, call that L
ɠ - read a line from STDIN
Œt - title-case it (e.g. "wOrLd" -> "World")
Ḋ - dequeue L: ["World"]
e - exists in? (0 or 1)
ȧ - and L (0 or ["Ah, yes.","World"])
K - join with spaces (0 or "Ah, yes. World")
D - "No. That isn't what I meant"
ȯ - or ("No. That isn't what I meant" or "Ah, yes. World")
”. - literal '.'
; - concatenate ("No. That isn't what I meant." or "Ah, yes. World.")