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fractionalSecond

const fractionalSecond: RegExp = /^[0-9]{1,9}$/;

RegExp matching 1–9 fractional-second digits (nanosecond precision).

import { fractionalSecond } from "@northguild/gmt";
fractionalSecond.test("123") // true (milliseconds)
fractionalSecond.test("123456789") // true (nanoseconds)
fractionalSecond.test("1234567890") // false (more than 9 digits)
fractionalSecond.test("") // false (empty)

regex/time.ts