All files form_validator.js

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function isValidCommaDelimitedList(value) {
  // allow letters, commas, and spaces
  const commaDelimitedListRegEx = /^[A-Za-z,\s]+$/;
  return commaDelimitedListRegEx.test(value);
}
 
function isValidTagmode(value) {
  return value === 'all' || value === 'any';
}
 
function hasValidFlickrAPIParams(tags, tagmode) {
  return isValidCommaDelimitedList(tags) && isValidTagmode(tagmode);
}
 
module.exports = {
  isValidCommaDelimitedList,
  isValidTagmode,
  hasValidFlickrAPIParams
};