java - Extracting items inside a string -

i want extract hello world inside particular string getting first , last occurences.there 3(three) hello world text inside string want them on each particular string.

string text="hellogfddfdfsdsworldhelloasaasasdasdggworldfdfdsdhellodasasddworld"; int x=text.indexof("hello"); int y=text.indexof("world"); string test=text.substring(x, y+4); system.out.println(test); x=text.indexof("hello"); y=text.indexof("world"); string test1=text.substring(x,y); system.out.println(test1); x=text.lastindexof("hello"); y=text.lastindexof("world); string test2=text.substring(x, y); system.out.println(test2); 

sounds job regular expression. simplest 1 be

list<string> matchlist = new arraylist<string>(); pattern regex = pattern.compile(     "hello # match 'hello'\n" +     ".*?   # match 0 or more characters (any characters), few possible\n" +     "world # match 'world'",      pattern.comments); matcher regexmatcher = regex.matcher(subjectstring); while (regexmatcher.find()) {     matchlist.add(regexmatcher.group()); }  

if want text between hello , world, use

pattern regex = pattern.compile(     "hello # match 'hello'\n" +     "(.*?) # match 0 or more characters (any characters), few possible\n" +     "world # match 'world'",      pattern.comments); matcher regexmatcher = regex.matcher(subjectstring); while (regexmatcher.find()) {     matchlist.add(regexmatcher.group(1)); }  

note fails if patterns can nested, i. e. hello foo hello bar world baz world.