How do I check that a string is a valid account address?

[banool]

Originally from Stack Overflow.

I made an app that returns user assets from the Aptos blockchain. In the app, I have a form for the user's address. My goal is to validate that address using RegExp or something like that.

[banool]

You can do that with the TS SDK like this:

import { AccountAddress } from "../../src";

function myFunction {
    let addr = "0x1";
 
    // Get an actual AccountAddress object.
    let accountAddress = AccountAddress.from(addr);

    // Just check if the account address is valid.
    let result = AccountAddress.isValid(addr);
    let valid = result.valid;
}

You can learn more about AccountAddress here: https://aptos-labs.github.io/aptos-ts-sdk/@aptos-labs/ts-sdk-1.9.1/classes/AccountAddress.html.