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    \$\begingroup\$ You can replace your regexps with [^a-z] [^A-Z] [^0-9] and you can use getBytes() instead of toCharArray() \$\endgroup\$ Commented Jul 13, 2016 at 14:14
  • \$\begingroup\$ @cliffroot Thanks. I'm pretty bad at regexes, but not using the ^ (not) was pretty dumb.. ;) \$\endgroup\$ Commented Jul 13, 2016 at 15:10
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    \$\begingroup\$ removes repetitive replaceAll calls String c(int[]a,String z){String r[]={"[^a-z]","[^A-Z]","[^0-9]"},o="";for(byte c[],i=0;i<3;){c=z.replaceAll(r[a[i++]],"").getBytes();java.util.Arrays.sort(c);o+=new String(c);}return o;} \$\endgroup\$ Commented Jul 13, 2016 at 15:49