40 lines
771 B
Lua
40 lines
771 B
Lua
local function remove(str, start, _end)
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local start_part = str:sub(1, start - 1)
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local end_part = str:sub(_end + 1, -1)
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return start_part .. end_part
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end
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local function remove_patterns(str, pattern)
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while true do
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local rem_start, rem_end, _ = str:find(pattern)
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if rem_start == nil then
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break
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end
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str = remove(str, rem_start, rem_end)
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end
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return str
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end
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local function ispali(str)
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str = str:lower()
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-- format
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str = remove_patterns(str, "%s")
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str = remove_patterns(str, "%p")
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return str == str:reverse()
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end
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local function test(str)
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print(("%s: %q"):format(str, ispali(str)))
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end
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test("step on no pets")
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test("banana")
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print()
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test("Step. On no pets!")
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test("Banana??")
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