im-angular-validators/esm2020/lib/validators/number-decimal-places.validator.mjs

This library will help you with lots of already written mostly used validators for Angular 2+ applications.

export const IMNumberDecimalPlacesValidator = (scale = 0, fixed = false) => {
    return (control) => {
        const scaling = fixed ? `${scale}` : `0,${scale}`;
        const regexp = new RegExp(`^-?([0-9]*[.]?)?[0-9]{${scaling}}$`);
        if (control.value && !regexp.test(control.value)) {
            return {
                areDecimalPlacesInvalid: {
                    isInvalid: true,
                    scale,
                    fixed
                }
            };
        }
    };
};
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