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test: seed the group a backward search miss has to clear #7151

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Merged
matz merged 1 commit into from
Aug 14, 2026
Merged

test: seed the group a backward search miss has to clear #7151

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8 changes: 6 additions & 2 deletions mrbgems/mruby-regexp/test/string_index.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -607,13 +607,17 @@ def fake.match(str, pos = 0); raise "must not be called"; end
assert_nil $2
assert_equal "b", $+

# and a search that finds nothing clears all of them, not `$~` alone
"zzz" =~ /(z)/
# and a search that finds nothing clears all of them, not `$~` alone. Two
# groups are seeded so that a `$2` left standing is one the clear missed
# rather than one no seed ever filled
"zzz" =~ /(z)(z)/
assert_nil "abc".rindex(/x/)
assert_nil $~
assert_nil $&
assert_nil $`
assert_nil $'
assert_nil $1
assert_nil $2
assert_nil $+
end

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