Java Regex cant save text to string -

i trying save bolded text string.
have come regex "routename?.+?routelengthkm" , according online regex tester should me want find method returning true/false. how can save bolded text string?

"routes:[{routename:dulles toll rd w; sr-28 s,routedurationinminutes:18,routelengthkm:21.474,routelengthmiles:13.343320854,toll:true},{routename:frying pan rd; sr-28 s,routedurationinminutes:18,routelengthkm:19.437,routelengthmiles:12.077588127,toll:false}

package regex; import java.util.regex.*;  public class regexclass {    public static void main (string args[]){     pattern p= pattern.compile("routename?.+?routelengthkm");     matcher m= p.matcher("routes:[{routename:dulles toll rd w; sr-28 s,routedurationinminutes:18,routelengthkm:21.474,routelengthmiles:13.343320854,toll:true},{routename:frying pan rd; sr-28 s,routedurationinminutes:18,routelengthkm:19.437,routelengthmiles:12.077588127,toll:false}]");     system.out.println(m.find());    } } 

m.find(); launch matching engine. try match regex against text. returns true if match found, , false if no match found. normally, use construct find matches:

while(m.find()) {}

after having found match (i.e. after m.find(); or better if (m.find()) {), can retrieve match m.group(n); n group number. 0 full match group , other numbers there (1,2,3,...) refer subgroups (things in parentheses).