String S= "multiply 3 add add 3 3 1"
I want to get two string arrays The one is {"multiply", "add", "add"} Another out is {"3","3","3",1}
How can I get it? I tried to use
String operators[] = s.split("[0-9]+"); String operands[] =s.split("(?:add|multiply)"); But, it doesn't work.
You should use Matcher instead of split:
import java.util.regex.Matcher; import java.util.regex.Pattern; ... List<String> operators = new ArrayList<String>(); Matcher m = Pattern.compile("add|multiply").matcher(s); while (m.find()) { operators.add(m.group()); } List<String> operands = new ArrayList<String>(); Matcher m = Pattern.compile("[0-9]+").matcher(s); while (m.find()) { operands.add(m.group()); } 
1).You can use java 8 groupingBy.
Map<Boolean, List<String>> map = Arrays .stream(s.split(" ")) .collect(Collectors.groupingBy(e -> e.matches("\\d+"))); System.out.println(map); The result is:
{false=[multiply, add, add], true=[3, 3, 3, 1]} You can get operators and operands by:
List<String> operators = map.get(false); List<String> operands = map.get(true); 