Should allow regex testing on extensions

[raix]

When using this together with jest we want*.snap and *.test.(j|t)sx? to be type "None"

{
  // ...
  "\\.test\\.(t|j)sx?$|\\.snap$": "None"
}

[azz]

Try setting "csproj.itemType".

"csproj.itemType": {
 "*": "Content",
 ".ts": "TypeScriptCompile",
 ".snap": "None"
}