Feedback on regex parser PR

[danmoseley]

Feedback from #88558

[ghost]

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Issue Details

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Feedback from #88558

Author:	danmoseley
Assignees:	danmoseley
Labels:	area-System.Text.RegularExpressions
Milestone:	-

[stephentoub]

Thanks

[danmoseley]

cases)
  Starting:    System.Net.NameResolution.Functional.Tests (parallel test collections = on, max threads = 2)
Process terminated. Assertion failed.
   at System.Net.NetEventSource.Info(String thisOrContextObject, String memberName, String message) in /_/src/libraries/Common/src/System/Net/Logging/NetEventSource.Common.cs:line 80
   at System.Net.NetEventSource.Info(Object thisOrContextObject, FormattableString formattableString, String memberName) in /_/src/libraries/Common/src/System/Net/Logging/NetEventSource.Common.cs:line 67
   at System.Net.Dns.<>c.<GetHostEntryAsync>b__6_0(Task`1 t, Object s) in /_/src/libraries/System.Net.NameResolution/src/System/Net/Dns.cs:line 127
   at System.Threading.Tasks.ContinuationTaskFromResultTask`1.InnerInvoke() in /_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:line 140