Java String Regex split and capture splitted portion

Here's an example of what you want to achieve.

String input = "Card 41: Slot Type : SFC Card 42: Slot Type : " +
                "PFC Card 43: Slot Type : GFC Operational State : Empty " +
                "Card 44: Slot Type : KFC Card 45: Slot Type : SFC";
//                           | starts with "Card"
//                           |   | any white space
//                           |   |   | group 1: any digits
//                           |   |   |     | any characters, reluctantly
//                           |   |   |     |  | group 2: looking for 3 capital letter characters
Pattern p = Pattern.compile("Card\\s+(\\d+).+?([A-Z]{3})");
Matcher m = p.matcher(input);
// key set of map will be ordered lexicographically
// if you want to retain insertion order instead, use LinkedHashMap
// for better performance, just a HashMap
Map<String, String> map = new TreeMap<String, String>();
// iterate over find
while (m.find()) {
    map.put(m.group(1), m.group(2));
}
System.out.println(map);

Output

{41=SFC, 42=PFC, 43=GFC, 44=KFC, 45=SFC}

To Tokenize, use Capture Groups

This regex will parse your string:

Card (\d+): Slot Type : (\w+)

As you can see in the right pane of the Regex Demo, capture Groups 1 and 2 contain the tuples you want.

Sample Java Code

Here is how to retrieve your tuples:

Pattern regex = Pattern.compile("Card (\\d+): Slot Type : (\\w+)");
Matcher regexMatcher = regex.matcher(subjectString);
while (regexMatcher.find()) {
    // The Card
    System.out.println(regexMatcher.group(1));
    // The Slot Type
    System.out.println(regexMatcher.group(2));
} 

Of course instead of printing the values, you can assign them to any data structure you like.

Explanation

• Card matches literal chars
• (\d+) captures the number to Group 1
• : Slot Type : matches literal chars
• (\w+) captures the slot type to Group 2

Card (\d+):.+?: ?(\w+) should do the trick with the global modifier.

• (\d+) captures the digits after Card
• (\w+) captures the letters after the second semicolon

Demo on RexEx101