validarNumTarjeta, checkRut, formatearRut 🇨🇱

bankValidators.js

function validarNumTarjeta(element, show){
  exvisa = /^4[0-9]{3,}$/g;
  exmaster = /^5[1-9][0-9]{2,}$/g;
  examerican = /^3[47][0-9]{2,}$/g;
  exdinner= /^3(?:0[0-5]|[68][0-9])[0-9]{1,}$/g;
  element.on('input', function(e){
      if (/\D/g.test(this.value)){
        this.value = this.value.replace(/\D/g, '');
        var text = this.value.replace(/\D/g, '').split('');
        if(text.length <= 16){
          var textoFinal ="";
          $.each(text, function(index, value){
            if(index%4 === 0 && index>0){textoFinal+=" ";}
            textoFinal+=value;
            if(index === text.length-1){element.val(textoFinal);}
          });
        }else{this.value = this.value.substr(0,16);}
      }else{
        var cod = this.value.replace(/\D/g,'');
        var text = this.value.replace(/\D/g,'').split('');
        if(text.length <= 16){
          var textoFinal ="";
          $.each(text, function(index, value){
            if(text.length >= 4 && show){
              if(exvisa.test(cod)){$("#visa-card").show();}
              if(exmaster.test(cod)){$("#master-card").show();}
              if(exdinner.test(cod)){$("#dinners-card").show();}
              if(examerican.test(cod)){$("#american-card").show();}
            }else{
              $("#visa-card").hide();
              $("#american-card").hide();
              $("#master-card").hide();
              $("#dinners-card").hide();
            }
            if(index%4 === 0 && index>0){textoFinal+=" ";}
            textoFinal+=value;
            if(index === text.length-1){element.val(textoFinal);}
          });
        }else{this.value = this.value.substr(0,16);}
      }
  });
}

function checkRut(rut) {
  var valor = rut.replace(/[.]/g,'');
  valor = valor.replace(/[-]/g,'');
  cuerpo = valor.slice(0,-1);
  dv = valor.slice(-1).toUpperCase();
  rut = cuerpo + '-'+ dv;
  if(cuerpo.length < 7) {return false; }
  suma = 0;
  multiplo = 2;
  for(i=1;i<=cuerpo.length;i++) {
      index = multiplo * valor.charAt(cuerpo.length - i);
      suma = suma + index;
      if(multiplo < 7) { multiplo = multiplo + 1; } else { multiplo = 2; }
  }
  dvEsperado = 11 - (suma % 11);
  dv = (dv == 'K')?10:dv;
  dv = (dv == 0)?11:dv;
  if(dvEsperado != dv) {return false; }
  return true;
}

function formatearRut(element){
  element.on('input', function(e){
    var text = this.value.replace(/[.-]/g,'');
    if(text[text.length-1].toUpperCase() === "K" && text[text.length-2].toUpperCase() === "K"){ text = text.substr(0,text.length-1); }
    var textoFinal = "";
    $.each(text.split(''), function(index, value){
      textoFinal.replace(/[.-]/g,'');
      if( !(/[0-9]/g).test(value) && value!=='k' && value!=='K'){
        value = '';
      }else{
        if(text.length<=8){
          if(index!=7 && (value!=='k' || value!=='K')){value= value.replace(/\D/g,'');}
          if(index === 1){textoFinal+=".";}
          if(index === 4){textoFinal+=".";}
          if(index === 7){textoFinal+="-";}
          textoFinal+=value;  
        }else{
          if(index!=8 && (value!=='k' || value!=='K')){value= value.replace(/\D/g,'');}                
          if(index === 2){textoFinal+=".";}
          if(index === 5){textoFinal+=".";}
          if(index === 8){textoFinal+="-";}
          textoFinal+=value;  
        }
      }
    });
    this.value = textoFinal;
    checkRut(this.value) ? this.setCustomValidity('') : this.setCustomValidity('Rut Invalido');
  });
};