Add Regex String Types

[NightshadeX9X]

Add Regex String Types

⭐ Suggestion

I'd like to see Regex types be added into typescript. This would allow us to create types for specific necessary strings. I feel like adding template literal types was a step in the right direction, but this would be even better.

📃 Example

type AllUppercase = /^[A-Z]+$/;

let myLowercaseVariable: AllUppercase = "test"; // error
let myUppercaseVariable: AllUppercase = "TEST"; // works

[MartinJohns]

Duplicate of #41160. Used search terms: regex in:title

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