Java - Filtering List Entries by Regex

Question

My code looks like this:

List filterList(List list, String regex) {
  List result = new ArrayList();
         


        

Answer 1

Google's Java library(Guava) has an interface Predicate which might be pretty useful for your case.

static String regex = "yourRegex";

Predicate matchesWithRegex = new Predicate() {
        @Override 
        public boolean apply(String str) {
            return str.matches(regex);
        }               
};

You define a predicate like the one above and then filter your list based on this predicate with a single-line code:

Iterable iterable = Iterables.filter(originalList, matchesWithRegex);

And to convert the iterable to a list, you can again use Guava:

ArrayList resultList = Lists.newArrayList(iterable);