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Enable Regex compiler to be trimmed #41075
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Today an app that just does: ```C# Console.WriteLine(Regex.IsMatch("12345", "0*[1-9][0-9]*")); ``` and is trimmed will end up publishing a 105K System.Text.RegularExpression.dll, including the regex compiler for when the RegexOptions.Compiled is used. We can refactor the constructors such that the compiler only ends up getting rooted when one of the ctors that takes options is used. After this PR, if you don't pass RegexOptions, the 105K drops to 85K. 
stephentoub commented Sep 12, 2019
src/System.Text.RegularExpressions/src/System/Text/RegularExpressions/Regex.cs Show resolved Hide resolved
ViktorHofer approved these changes Sep 12, 2019
jkotas approved these changes Sep 12, 2019
stephentoub added the assembly-size 
picenka21 pushed a commit to picenka21/runtime that referenced this pull request Feb 18, 2022
Today an app that just does: ```C# Console.WriteLine(Regex.IsMatch("12345", "0*[1-9][0-9]*")); ``` and is trimmed will end up publishing a 105K System.Text.RegularExpression.dll, including the regex compiler for when the RegexOptions.Compiled is used. We can refactor the constructors such that the compiler only ends up getting rooted when one of the ctors that takes options is used. After this PR, if you don't pass RegexOptions, the 105K drops to 85K. Commit migrated from dotnet/corefx@31a5bba Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in.
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Today an app that just does:
and is trimmed will end up publishing a 105K System.Text.RegularExpression.dll, including the regex compiler for when the RegexOptions.Compiled is used. We can refactor the constructors such that the compiler only ends up getting rooted when one of the ctors that takes options is used. After this PR, if you don't pass RegexOptions, the 105K drops to 85K.
cc: @ViktorHofer, @jkotas (@danmosemsft, just an example of what we talked about today)