https://learn.microsoft.com/fr-fr/dotnet/api/system.text.regularexpressions.regex.roptions?view=netframework-4.8.1&viewFallbackFrom=net-10.0
Regex.roptions Field (System.Text.RegularExpressions) | Microsoft Learn
Used by a Regex object generated by the CompileToAssembly method.
field systemregextextmicrosoftlearn