Mask code

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Posted on by TaniSantos

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Hello everyone my name is Taniguchi, the id document you use in your country in mine is named "CPF" and i have a code to put a mask in the ID but i have trouble to understand some parts.

function maskCPF(executionContext) {

var attribute = executionContext.getEventSource();

var cpf = attribute.getValue();

cpf = cpf.toString();

cpf=cpf.replace(/\D/g,"");

cpf=cpf.replace(/(\d{3})(\d)/,"$1.$2");

cpf=cpf.replace(/(\d{3})(\d{1,2})$/,"$1-$2");

Xrm.Page.getAttribute("crd4c_cpf").setValue(cpf);

}

what the meaning of this parts:

cpf=cpf.replace(/(\d{3})(\d)/,"$1.$2");

cpf=cpf.replace(/(\d{3})(\d{1,2})$/,"$1-$2");

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Hi Taniguchi,

It simply means that it will replace the match of the regular expression, (\d{3})(\d), with the first capture group followed by a "." and then the second capture group.

So, if cpf was initially set to 12345, then after the line executes,

cpf=cpf.replace(/(\d{3})(\d)/,"$1.$2");

it will be 123.45, i.e., place a . after the first three digits. However, if you have cpf initially set to abc12345, then after the first line executes, it will be equal to abc123.45

If you want to trace how regular expressions are evaluated, kindly look here (https://regex101.com/r/VwBrmU/1). That tells you the first capturing group is \d{3} which means, it is looking for a digit between [0-9] and the quantifier is 3, so it is looking exactly for 3 digits.

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RaviKashyap 55,410 Moderator on at

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Hi Taniguchi,

As mentioned above as well, this is code to replace the current text based on the regular expression.

Hope this helps.

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@Ravi: Sorry for nitpicking, but it is not technically replacing the current text. It is simply reformatting based on the matched results of the regular expression criteria. It is a minor point, but a very important point to note. The use of $n doesn't replace even though it is used in conjunction with replace method. In fact, even the replace method returns a new string and the original string is left untouched.

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RaviKashyap 55,410 Moderator on at

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yes technically you are right with the info around Replace method but wouldn't the below statement/code replace the current text of the variable cpf once executed?

cpf=cpf.replace(/(\d{3})(\d)/,"$1.$2");

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Yes, which is why I mentioned nitpicking.

The OP's (Original Poster's) code will replace the text in variable cpf, but that is because of the assignment back to the cpf variable itself, not because of the replace function. Something similar to strings in C#, I can say

string myName = "Sara W Ellis"; myName = myName.Replace(' ','.'); Console.WriteLine(myName);

And the output would be

Sara.W.Ellis

but it is not replacing myName with Sara.W.Ellis, it is returning a new string (original string is untouched) and I am just pointing the variable myName to the new string.

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