The Daily WTF

Many nations have some form of national identification number, especially around taxes. Argentina is no exception.

Their “CUIT” (Clave Única de Identificación Tributaria) and “CUIL” (Código Único de Identificación Laboral) are formatted as “##-########-#”.

Now, as datasets often don’t store things in their canonical representation, Nick‘s co-worker was given a task: “given a list of numbers, reformat them to look like CUIT/CUIL. That co-worker went off for five days, and produced this Java function.

public String normalizarCuitCuil(String cuitCuilOrigen){ String valorNormalizado = new String(); if (cuitCuilOrigen == null || “”.equals(cuitCuilOrigen) || cuitCuilOrigen.length() < MINIMA_CANTIDAD_ACEPTADA_DE_CARACTERES_PARA_NORMALIZAR){ valorNormalizado = “”; }else{ StringBuilder numerosDelCuitCuil = new StringBuilder(13); cuitCuilOrigen = cuitCuilOrigen.trim(); // Se obtienen solo los números: Matcher buscadorDePatron = patternNumeros.matcher(cuitCuilOrigen); while (buscadorDePatron.find()){ numerosDelCuitCuil.append(buscadorDePatron.group()); } // Se le agregan los guiones: valorNormalizado = numerosDelCuitCuil.toString().substring(0,2) + “-” + numerosDelCuitCuil.toString().substring(2,numerosDelCuitCuil.toString().length()-1) + “-” + numerosDelCuitCuil.toString().substring(numerosDelCuitCuil.toString().length()-1, numerosDelCuitCuil.toString().length()); } return valorNormalizado; }

We start with a basic sanity check that

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