Source: node_modules/bson/lib/bson/regexp.js

/**
 * A class representation of the BSON RegExp type.
 *
 * @class
 * @return {BSONRegExp} A MinKey instance
 */
function BSONRegExp(pattern, options) {
  if(!(this instanceof BSONRegExp)) return new BSONRegExp();

  // Execute
  this._bsontype = 'BSONRegExp';
  this.pattern = pattern || '';
  this.options = options || '';

  // Validate options
  for(var i = 0; i < this.options.length; i++) {
    if(!(this.options[i] == 'i'
      || this.options[i] == 'm'
      || this.options[i] == 'x'
      || this.options[i] == 'l'
      || this.options[i] == 's'
      || this.options[i] == 'u'
    )) {
      throw new Error('the regular expression options [' + this.options[i] + "] is not supported");
    }
  }
}

module.exports = BSONRegExp;
module.exports.BSONRegExp = BSONRegExp;