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Question: How can I verify that the format of a Mexican RFC is valid?

What is the RFC? The Federal Taxpayer Registry (RFC) is a unique key that every natural or legal person in Mexico requires to carry out any lawful economic activity. It is the tax code for individuals and companies issued by the SAT .

The RFC is generated from the letters of the name and surname (individuals), or from the initials or the first letters of the name and the date of creation (companies). The generation and validation rules are described in the Algorithm to generate the RFC with homoclave for natural and legal persons.odt ? .

Context: I want to validate that an RFC could be valid. I'm not interested in seeing if it actually exists. I implemented a very generic validation that allows the last 3 digits to be optional:

/^[A-ZÑ&]{3,4}\d{6}(?:[A-Z\d]{3})?$/

but now I am interested in more strictly validating the complete RFC, seeing that the check digit is correct (the last character).

Question: How can I verify that the format of a Mexican CURP is valid?

What is CURP? The Unique Population Registry Key (CURP) is a unique 18-character alphanumeric identity code used to officially identify both Mexican residents and citizens, issued by RENAPO .

It is formed from the letters of the names and surnames, the date and the state of birth, and the sex. Also, character 17 is to avoid duplicates, and the last character is a digit that is used as an error detector-corrector. The syntax is detailed in the Normative Instructions for the Assignment of the Unique Population Registry Key ? .

Context: I'm only interested in validating that a key could be valid. I am not interested at this point to see if that CURP exists or not.

So far, I'm just checking that it's 18 alphanumeric characters with the regex:

/^[A-Z\d]{18}$/

but I am also interested in considering that the characters are valid, and that the check digit matches.

If I have a string variable with the following value:

var myString = "{'nombre':'juan'}";

How can I convert a string to a JSON object in JavaScript?

Over the time I've worked with the JavaScript language, I've used different ways to create objects through what could properly be the emulation of a class (or object literal).

The forms I have worked with are the following:

1. Closures :

   var NombreClase = (function () {
       function NombreClase () {}
   
       NombreClase.prototype.metodo = function () {
           // código
       }
   
       NombreClase.metodoEstático = function () {
           // código
       }
   
       function metodoPrivado () {
           // código
       }
   
       return NombreClase;
   })();
   

2. Prototype ( prototype) :

   function NombreClase (arg1, arg2) {
       this.arg1 = arg1;
       this.arg2 = arg2;
   }
   
   NombreClase.prototype.metodo = function () {
       // código
   }
   
   NombreClase.metodoEstático = function () {
       // código
   }
   

3. Literal object :

   var NombreClase = {
       prop: 'foo',
       metodo: function () {
           // body...
       }
   };
   

I would like to objectively know what is the best way to use it? Is there another way? And why is it recommended?

I need to horizontally center the div inner inside the outer based on this HTML and CSS code:

<div class="externo">
    <div class="interno">
    </div>
</div>

.interno {
    background-color: green;
    height: 20px;
    width: 50%;
}

.externo {
    background-color: red;
    width: 200px;
    padding: 20px;
}

JSFiddle: https://jsfiddle.net/fpvkcrkg/