Question

This is my original String:

String response = "attributes[{"id":50,"name":super},{"id":55,"name":hello}]";

I’m trying to parse the String and extract all the id values e.g
50
55

Pattern idPattern = Pattern.compile("{\"id\":(.*),");
Matcher matcher = idPattern.matcher(response);

while(matcher.find()){
    System.out.println(matcher.group(1));
}

When i try to print the value i get an exception:
java.util.regex.PatternSyntaxException: Illegal repetition

Not had much experience with regular expressions in the past but cannot find a simple solution to this online.
Appreciate any help!

Answer 1

Don’t use a greedy match operator like * with a . which matches any character. unnecessarily.
If you want the digits extracted, you can use \d.

"id":(\d+)

Within a Java String,

Pattern.compile("\"id\":(\\d+)");