bot-28/node/node_modules/validator/es/lib/isBase58.js

import assertString from './util/assertString';

// Accepted chars - 123456789ABCDEFGH JKLMN PQRSTUVWXYZabcdefghijk mnopqrstuvwxyz
var base58Reg = /^[A-HJ-NP-Za-km-z1-9]*$/;
export default function isBase58(str) {
  assertString(str);
  if (base58Reg.test(str)) {
    return true;
  }
  return false;
}