https://learn.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.groupcollection.item?view=netframework-4.8.1&redirectedfrom=MSDN
GroupCollection.Item[] Property (System.Text.RegularExpressions) | Microsoft Learn
Enables access to a single member of the collection by integer or string index.
property systemitemtextmicrosoftlearn
https://learn.microsoft.com/es-es/dotnet/api/system.text.regularexpressions.groupcollection.item?view=netframework-4.8.1
GroupCollection.Item[] Property (System.Text.RegularExpressions) | Microsoft Learn
Enables access to a single member of the collection by integer or string index.
property systemitemtextmicrosoftlearn