Why does "^[./]" match "../"?

[PaulRBerg]

Given the following prettier configuration:

importOrder: ["<THIRD_PARTY_MODULES>", "^[./]"]
importOrderSeparation: true
importOrderSortSpecifiers: true

And the following imports:

import type { Greeter } from "../src/types/Greeter";
import type { SignerWithAddress } from "@nomiclabs/hardhat-ethers/dist/src/signer-with-address";
import type { Fixture } from "ethereum-waffle";

This plugin reorders the imports like this:

import type { SignerWithAddress } from "@nomiclabs/hardhat-ethers/dist/src/signer-with-address";
import type { Fixture } from "ethereum-waffle";

import type { Greeter } from "../src/types/Greeter";

That works for me just fine, but I want to understand why it works in the first place.

Why does ^[./] match the ../src/types/Greeter import? I would have expected to have to add another regular expression, e.g. ^[../].

[msellsactivecampaign]

The regular expression [./] is the character set that includes a . and /, so it's just looking for anything that has a period or slash as the first character.