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rfind bugfix: handle empty pattern like string.find

This commit is contained in:
Kartik K. Agaram 2023-10-15 14:21:41 -07:00
parent 6b723363b8
commit ea4a8379fe
1 changed files with 2 additions and 0 deletions
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2
search.lua
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@ -131,6 +131,7 @@ end
-- Particularly if we only care about literal matches, we don't need all of string.find
function rfind(s, pat, i, plain)
if s == nil then return end
if #pat == 0 then return #s end
local rs = s:reverse()
local rpat = pat:reverse()
if i == nil then i = #s end
@ -143,6 +144,7 @@ function rfind(s, pat, i, plain)
end
function test_rfind()
check_eq(rfind('abc', ''), 3, 'empty pattern')
check_eq(rfind('abc', 'c'), 3, 'final char')
check_eq(rfind('acbc', 'c', 3), 2, 'previous char')
check_nil(rfind('abc', 'd'), 'missing char')