Number validations - String Inputs - Typescript

Number Validator

export class NumberValidators {

    /**
     * Only works for Integer & Positive Number
     * @param val String containing number like "$1,123,123"" or "1234" or "1,213" etc
     */
    static IsPositiveNumber(val: string): boolean {
        return !GeneralValidators.GetNumberFromString(val) ? false : true;
    }

    /**
     * Returns if Number is Non-Negative or Not.
     * @param val String containing number like "$-1,123,123", "-$1,123,123" or "-1234" or "-1,213" etc
     */
    static IsNonNegativeNumber(val: string): boolean {
        if (GeneralValidators.GetNumberFromString(val) === null) {
            return false;
        }
        return GeneralValidators.GetNumberFromString(val) >= 0 ? true : false;
    }

    /**
     * Only works for Integer & Positive Number
     * @param val String containing number like "$1,123,123"" or "1234" or "1,213" etc
     */
    static GetNumberFromString(val: string): number {
        val = val ? val + '' : "";
        val = val.replace(/[$,]/g, '');

        if (val.match(/^\d+$/) || val.match(/^-\d+$/)) {
            return Number.parseInt(val) !== NaN ? Number.parseInt(val) : null
        } else if (val.match(/^\d+\.\d+$/) || val.match(/^-\d+\.\d+$/)) {
            return Number.parseFloat(val) !== NaN ? Number.parseFloat(val) : null;
        } else {
            return null;
        }
    }
}