Fix handling of atomic nodes in RegexCompiler / source generator #66046
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Tagging subscribers to this area: @dotnet/area-system-text-regularexpressions Issue DetailsWe weren't properly resetting the stack position, so if we had an atomic group that contained something that backtracked, any backtracking positions left on the stack by that nested construct would then be consumed by a previous backtracking construct and lead to it reading the wrong state.
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joperezr
reviewed
Mar 2, 2022
...libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexCompiler.cs
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joperezr
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Mar 2, 2022
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Thanks, @joperezr. I realized we have a similar issue for positive/negative lookaheads, which are implicitly atomic, so I pushed a small commit to address those, too. |
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We weren't properly resetting the stack position, so if we had an atomic group that contained something that backtracked, any backtracking positions left on the stack by that nested construct would then be consumed by a previous backtracking construct and lead to it reading the wrong state.
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We weren't properly resetting the stack position, so if we had an atomic group that contained something that backtracked, any backtracking positions left on the stack by that nested construct would then be consumed by a previous backtracking construct and lead to it reading the wrong state.