pattern does not work when use a regexp with attributes about jsonschema

[yhojann-cl]

I found the problem in lib/attribute.js:687:

/**
 * Validates whether the instance value matches the regular expression, when the instance value is a string.
 * @param instance
 * @param schema
 * @return {String|null}
 */
validators.pattern = function validatePattern (instance, schema, options, ctx) {
  if (!this.types.string(instance)) return;
  var result = new ValidatorResult(instance, schema, options, ctx);
  var pattern = schema.pattern;
  try {
    var regexp = new RegExp(pattern, 'u');
  } catch(_e) {
    // In the event the stricter handling causes an error, fall back on the forgiving handling
    // DEPRECATED
    regexp = new RegExp(pattern);
  }
  if (!instance.match(regexp)) {
    result.addError({
      name: 'pattern',
      argument: schema.pattern,
      message: "does not match pattern " + JSON.stringify(schema.pattern.toString()),
    });
  }
  return result;
};

The code var regexp = new RegExp(pattern, 'u'); override the i modificator as case sensitive ignore.

    regexp = new RegExp(pattern);
  }
  console.log(regexp); // <<-- Test output final regexp
  if (!instance.match(regexp)) {

• The old regexp: /^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i
• The new regexp: /^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/u

In the examples says can use regexp in plain method https://github.com/tdegrunt/jsonschema/blob/master/examples/all.js#L207 :

"validatePattern2": {
      "type": "string",
      "pattern": /str/
    },

But the documentation does not indicate that in these cases you can or cannot use modifiers like case insensitive in pattern object.