AngularJS: Error – Argument of type ‘RegExp’ is not assignable to parameter of type ‘string’

While working on a test project in AngularJS with Typescript, I came across this specific error:

Argument of type 'RegExp' is not assignable to parameter of type 'string'

Code:

let expression = new RegExp(/(test)=\(A:([0-9.]*)\)/g);

The problem is that I am duplicating the initialization process of Regex, first, it set up regular expression by standard syntax (/ /g) and then re-setup regular expression using constructor ( new RegExp() )

Solution 1:

let expression = /(test)=\(A:([0-9.]*)\)/g;

Solution 2:

let expression = new RegExp('(test)=\(A:([0-9.]*)\)', 'g');