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  1. /* 
  2.     Eliminar de una cadena en java todos los caracteres que no estén dentro del patrón
  3.     https://es.stackoverflow.com/q/113684/127
  4. */
  5.  
  6. class Ideone
  7. {
  8.     public static String soloNumFree (String texto) {
  9.         String patron = "\\d+(?:[.,]\\d+)*|Free";
  10.         String regex = String.format("(?:(?!%s)(?s:.))*(%s)?", patron, patron);
  11.  
  12.         return texto.replaceAll(regex, "$1");
  13.     }
  14.  
  15.  
  16.     public static void main (String[] args) throws java.lang.Exception
  17.     {
  18.         //Pruebas
  19.         String[] pruebas = {
  20.         	                "AU$26.95 с уч. GST",
  21.         	                "Free с уч. GST",
  22.         	                "#$%&/=123,456,789.01xxxFree Free!!! 3:)"
  23.         	               };
  24.  
  25.         for (String prueba: pruebas) {
  26.             String resultado = soloNumFree(prueba);
  27.             System.out.printf("%-40s --> '%s'%n", prueba, resultado);
  28.         }
  29.     }
  30. }
Success #stdin #stdout 0.05s 4386816KB
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AU$26.95 с уч. GST                       --> '26.95'
Free с уч. GST                           --> 'Free'
#$%&/=123,456,789.01xxxFree Free!!! 3:)  --> '123,456,789.01FreeFree3'
https://ideone.com/HEYyV1
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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