text: import assertString from './util/assertString.js';
  import merge from './util/merge.js';
  
  const lat = /^\(?[+-]?(90(\.0+)?|[1-8]?\d(\.\d+)?)$/;
  const long = /^\s?[+-]?(180(\.0+)?|1[0-7]\d(\.\d+)?|\d{1,2}(\.\d+)?)\)?$/;
  
  const latDMS = /^(([1-8]?\d)\D+([1-5]?\d|60)\D+([1-5]?\d|60)(\.\d+)?|90\D+0\D+0)\D+[NSns]?$/i;
  const longDMS = /^\s*([1-7]?\d{1,2}\D+([1-5]?\d|60)\D+([1-5]?\d|60)(\.\d+)?|180\D+0\D+0)\D+[EWew]?$/i;
  
  const defaultLatLongOptions = {
    checkDMS: false,
  };
  
  export default function isLatLong(str, options) {
    assertString(str);
    options = merge(options, defaultLatLongOptions);
  
    if (!str.includes(',')) return false;
    const pair = str.split(',');
    if ((pair[0].startsWith('(') && !pair[1].endsWith(')'))
      || (pair[1].endsWith(')') && !pair[0].startsWith('('))) return false;
  
    if (options.checkDMS) {
      return latDMS.test(pair[0]) && longDMS.test(pair[1]);
    }
    return lat.test(pair[0]) && long.test(pair[1]);
  }
  