[UseDotNetV2]handling semver v2 runtime preview versions

[tejasd1990]

Fix for

1. issue Validate version in UseDotNet 3.0 needs seperate logic for preview and non preview, where length of . seperated strings can be more than 3 #11612
2. issue [UseDotNetV2 task] Giving explicit semver v2 versions which have more than 3 dots(.) like 3.1.0-preview2.19525.6 gives error. #11718

[hiyadav]

@tejasd1990 can you run some manual pipelines while downloading

1. sdk
2. runtime

of semver version 1.0 and 2.0

with

1. exact versioning: 2.2.105
2. 3.0.x / 3.x (with include preview enabled and disabled)

We just need to be sure that we aren't breaking anything here.

[tejasd1990]

@hiyadav I have already tested various scenarios with the new change including versions which are v1 and v2

[TJEvans]

This is a slight breaking change as the 'x' version identifier is now case sensitive....

[tejasd1990]

Hi @TJEvans , The version identifier has always been case sensitive, it should be lower 'x'. Can you confirm whether it worked for you earlier with capital 'X' as well?

[TJEvans]

Prior to the task updating this was the logs,
2019-11-07T17:23:44.3328779Z ##[section]Starting: Use dotnet sdk 2.2.X 2019-11-07T17:23:44.3759718Z ============================================================================== 2019-11-07T17:23:44.3759933Z Task : Use .NET Core 2019-11-07T17:23:44.3760075Z Description : Acquires a specific version of the .NET Core SDK from the internet or the local cache and adds it to the PATH. Use this task to change the version of .NET Core used in subsequent tasks. Additionally provides proxy support. 2019-11-07T17:23:44.3760386Z Version : 2.0.21 2019-11-07T17:23:44.3760508Z Author : Microsoft Corporation 2019-11-07T17:23:44.3760682Z Help : https://aka.ms/AA4xgy0 2019-11-07T17:23:44.3760780Z ============================================================================== 2019-11-07T17:23:45.3619447Z Tool to install: .NET Core sdk version 2.2.X. 2019-11-07T17:23:46.4170769Z Found version 2.2.402 in channel 2.2 for user specified version spec: 2.2.X 2019-11-07T17:23:46.4687151Z Version: 2.2.402 was found in cache. 2019-11-07T17:23:46.4736116Z Creating global tool path and pre-pending to PATH. 2019-11-07T17:23:46.4787149Z ##[section]Finishing: Use dotnet sdk 2.2.X