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@ -131,6 +131,7 @@ end
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-- Particularly if we only care about literal matches, we don't need all of string.find
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function rfind(s, pat, i, plain)
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if s == nil then return end
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if #pat == 0 then return #s end
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local rs = s:reverse()
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local rpat = pat:reverse()
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if i == nil then i = #s end
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@ -141,3 +142,11 @@ function rfind(s, pat, i, plain)
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assert (endpos >= #pat)
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return endpos-#pat+1
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end
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function test_rfind()
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check_eq(rfind('abc', ''), 3, 'empty pattern')
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check_eq(rfind('abc', 'c'), 3, 'final char')
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check_eq(rfind('acbc', 'c', 3), 2, 'previous char')
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check_nil(rfind('abc', 'd'), 'missing char')
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check_nil(rfind('abc', 'c', 2), 'no more char')
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end
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