Fix code scanning alert - Polynomial regular expression used on uncontrolled data

[char0n]

Tracking issue for:

• [ ] https://github.com/swagger-api/swagger-js/security/code-scanning/27

[char0n]

Fully safe regexp: /\{([^{}]+)}|([^{}]+)/g

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  while ((text = re.exec(str))) {
    if (text[1]) results.push(text[1]);
  }
  return results;

[char0n]

The issue was mitigated in https://github.com/swagger-api/swagger-js/pull/3502

[char0n]

The issue was fully remediated in https://github.com/swagger-api/swagger-js/pull/3507