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fix #18128 rfind on empty needle returns rightmost index (#20430)

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rfind on empty needle returns haystack len
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n5m 2022-09-26 19:39:22 +00:00 • committed by GitHub
commit 9ca88a1889
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2 changed files with 18 additions and 13 deletions
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lib/pure/strutils.nim
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@ -2022,7 +2022,8 @@ func rfind*(s, sub: string, start: Natural = 0, last = -1): int {.rtl,
## See also:
## * `find func<#find,string,string,Natural,int>`_
if sub.len == 0:
return -1
let rightIndex: Natural = if last < 0: s.len else: last
return max(start, rightIndex)
if sub.len > s.len - start:
return -1
let last = if last == -1: s.high else: last