Determining If a String Contains a Substring - Java

String string = "Madam, I am Adam";

// Starts with
boolean b = string.startsWith("Mad"); // true

// Ends with
b = string.endsWith("dam"); // true

// Anywhere
b = string.indexOf("I am") > 0; // true

// To ignore case, regular expressions must be used

// Starts with
b = string.matches("(?i)mad.*");

// Ends with
b = string.matches("(?i).*adam");

// Anywhere
b = string.matches("(?i).*i am.*");