[FR] Add parameters pattern support

[DenisFerrero]

Feature request - Parameters pattern

Hi, I need to have a support for indicating pattern like validation in the parameters. For example:

password: { type: 'string', min: 8, pattern: /^[a-zA-Z0-9]+$/ }

or

password: { type: 'string', min: 8, pattern: '^[a-zA-Z0-9]+$' }

The patterns can be declared as RegExp (first example) or as a String (second example).

I tried to do something by myself and I realized this solution:

if (node.pattern && (node.pattern.length > 0 || node.pattern.source.length > 0))
  out.pattern = new RegExp(node.pattern).source;

I applied this code in the getTypeAndExample method, just before return out:

getTypeAndExample(node) {
  if (!node) {
    node = {};
  }
  let out = {};

  ...

  out.minLength = node.length || node.min;
  out.maxLength = node.length || node.max;

  /**** New code - Add pattern support ****/
  if (node.pattern && (node.pattern.length > 0 || node.pattern.source.length > 0))
    out.pattern = new RegExp(node.pattern).source;

  return out;
},

Can this solution be valid? Or it's necessary to apply something else in other places? If the solution is correct can you add this feature to your code?

[grinat]

@DenisFerrero released in v1.1.0