zcash-grant-system/frontend/client/utils/validators.ts

export function getAmountError(amount: number, max: number = Infinity) {
  if (amount < 0) {
    return 'Amount must be a positive number';
  } else if (
    amount.toFixed(3).length < amount.toString().length ||
    amount.toString().includes('1e')
  ) {
    return 'Must be in increments of 0.001';
  } else if (amount > max) {
    return `Cannot exceed maximum (${max} ZEC)`;
  }

  return null;
}

export function isValidEmail(email: string): boolean {
  return /\S+@\S+\.\S+/.test(email);
}

// Uses simple regex to validate addresses, doesn't check checksum or network
export function isValidAddress(address: string): boolean {
  // T address
  if (/^t[a-zA-Z0-9]{34}$/.test(address)) {
    return true;
  }
  // Sprout address
  if (/^z[a-zA-Z0-9]{94}$/.test(address)) {
    return true;
  }
  // Sapling address
  if (/^z(s)?(reg)?(testsapling)?[a-zA-Z0-9]{76}$/.test(address)) {
    return true;
  }
  return false;
}