String in String

[lllllIllIlllI]

Hi guys
Im pretty new to java after programming with python for about a year i thought i'd give it a go. I did have a quick question though.
How would i check for membership in a string.
For example

String str1="Hello world";
String str2 = "world";

Is there any way to check if str2 in str1?

Thanks!

[jwenting]

Is there any way to check if str2 in str1?

yes.

[peter_budo]

For start by using simple String methods such as String.indexOf(String), String.lastIndexOf(string) or with Regular Expressions