Set target framework to .NET Standard 2.0

Following guidelines at https://learn.microsoft.com/en-us/dotnet/standard/library-guidance/cross-platform-targeting

Support compiled regexes

What's Changed

• Add support for compiled regexes with the new RegexOptions.Compiled value
• Upgrade to .NET Standard 1.3 (to support System.Text.RegularExpressions.RegexOptions.Compiled)

Test release

Testing release via GitHub Actions

Test release

Testing release via GitHub Actions

Test release

Testing release via GitHub Actions

Test release

Moving NUGET_API_KEY to a Context in CircleCI (see documentation).

Deprecated methods removed

The following deprecated methods of RegexBuilder have been removed:

• StartGroup()
• StartNamedGroup()
• StartNonCapturingGroup()
• EndGroup()
• AddLogger()

Deprecated methods removed

The following deprecated methods of RegexBuilder have been removed:

• StartGroup()
• StartNamedGroup()
• StartNonCapturingGroup()
• EndGroup()
• AddLogger()

Deprecated methods removed

The following deprecated methods of RegexBuilder have been removed:

• StartGroup()
• StartNamedGroup()
• StartNonCapturingGroup()
• EndGroup()
• AddLogger()

Deprecated methods removed

The following deprecated methods of RegexBuilder have been removed:

• StartGroup()
• StartNamedGroup()
• StartNonCapturingGroup()
• EndGroup()
• AddLogger()