begin working on M3U parser. came up with very good regex to extract extinf data

src/main/java/com/mykola2312/mptv/parser/M3U.java

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+package com.mykola2312.mptv.parser;
+
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+import com.mykola2312.mptv.parser.M3UException.Type;
+
+public class M3U {
+    public class Item {
+        @NonNull
+        public String title;
+
+        public String groupTitle;
+        public String tvgLogo;
+
+        @NonNull
+        public String url;
+    }
+
+    public ArrayList<Item> items = new ArrayList<>();
+
+    public M3U(ArrayList<Item> items) {
+        this.items = items;
+    }
+
+    private static final Pattern HEADER = Pattern.compile("^#EXTM3U");
+    private static final Pattern EXTINF = Pattern.compile("^(?:#EXTINF:-?\\d\\s*)(.*?),(.*)$");
+
+    public static M3U parse(String data) throws M3UException {
+        ArrayList<Item> items = new ArrayList<>();
+
+        // state
+        boolean headerLine = true;
+
+        try (Scanner scanner = new Scanner(data)) {
+            while (scanner.hasNextLine()) {
+                String line = scanner.nextLine();
+
+                if (headerLine) {
+                    Matcher matcher = HEADER.matcher(line);
+                    if (!matcher.find()) {
+                        throw new M3UException(Type.NOT_AN_M3U);
+                    }
+
+                    headerLine = false;
+                } else {
+                    Matcher matcher = EXTINF.matcher(line);
+                    if (matcher.find()) {
+                        String tags = matcher.group(1);
+                        String title = matcher.group(2);
+
+                        System.out.printf("tags: %s | title: %s\n", tags, title);
+                    }
+                }
+            }
+        }
+
+        return new M3U(items);
+    }
+}

src/main/java/com/mykola2312/mptv/parser/M3UException.java

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+package com.mykola2312.mptv.parser;
+
+public class M3UException extends RuntimeException {
+    public enum Type {
+        NOT_AN_M3U
+    };
+
+    private static String typeToString(Type type) {
+        switch (type) {
+            case NOT_AN_M3U: return "not an m3u";
+            default: return type.toString();
+        }
+    }
+
+    public M3UException(Type type) {
+        super(typeToString(type));
+    }
+}