In the address book field, I have the zip field. In this field cep, I need to do some validations:
1 - Do not allow the user to enter a sequence with two numbers alternating with each other:
EX 1: "12121212"
EX 2: "12312312"
2 - Do not allow the user to enter a sequence of a certain number:
EX: "111111111"
How could I do this? I could not make a regex that would handle both situations.
You can validate the replicates with the following expression:
/([0-9]{2,3})/g
It will evaluate if there are groups of 2 or 3 repeated numbers, that is: 1212 or 123123
Example:
var cep = document.querySelector("input[name=cep]");
function fazRegex(){
var reg = /([0-9]{2,3})/g;
if(reg.test(cep.value))
document.querySelector("#resultado").innerHTML = "Errado";
else
document.querySelector("#resultado").innerHTML = "Certo";
}
cep.addEventListener("keyup", fazRegex);<input type="text" name="cep" onkeyup="fazRegex()"/>
<div id="resultado"></div>See also jsFindle
If you want to test the expression more thoroughly I strongly advise you to visit the site:
First I created a function to check for duplicates in the string, which works as follows: Check the last string if the numbers contain the repeat (using the previous reference) for the case of repeating 2 numbers.
Then I created one to check for repeated content, where I used a reduce content; I took the first position and checked if all others are equal to it, if so, it returns true ...
In the end I check for the denial of duplicates and all the duplicates exist to be a valid string.
var str1 = "121212122";
var str2 = "111111111";
var str3 = "123456789";
var is_repetidos = function(str) {
return /([0-9])+/g.test(str);
}
var todos_iguais = function(str) {
var conteudo_separado = str.split("");
return conteudo_separado.reduce(function(a, b) {
return a == b;
}, str[0]);
}
var is_valid = function(str) {
return !(is_repetidos(str) || todos_iguais(str));
}
var dados = [str1, str2, str3];
for (var i = 0; i < dados.length; i++) {
console.log(dados[i] + " = " + is_valid(dados[i]))
}