diff --git a/regex_humanizer/interactive.py b/regex_humanizer/interactive.py
new file mode 100644
index 0000000..c9d9251
--- /dev/null
+++ b/regex_humanizer/interactive.py
@@ -0,0 +1,291 @@
+"""Interactive REPL mode for exploring regex patterns."""
+
+import sys
+import os
+from typing import Optional
+from .parser import parse_regex
+from .translator import translate_regex
+from .test_generator import generate_test_cases
+from .flavors import get_flavor_manager
+
+
+def format_output(text: str, use_color: bool = True) -> str:
+    """Format output with optional color."""
+    if not use_color or not sys.stdout.isatty():
+        return text
+
+    try:
+        from pygments import highlight
+        from pygments.lexers import RegexLexer
+        from pygments.formatters import TerminalFormatter
+
+        lexer = RegexLexer()
+        formatter = TerminalFormatter()
+        return highlight(text, lexer, formatter)
+    except ImportError:
+        return text
+
+
+class InteractiveSession:
+    """Interactive session for regex exploration."""
+
+    def __init__(self, flavor: str = "pcre", use_color: bool = True):
+        self.flavor = flavor
+        self.use_color = use_color
+        self.history: list[str] = []
+        self.history_file = os.path.expanduser("~/.regex_humanizer_history")
+        self._load_history()
+
+    def _load_history(self):
+        """Load command history from file."""
+        if os.path.exists(self.history_file):
+            try:
+                with open(self.history_file, 'r') as f:
+                    self.history = [line.strip() for line in f if line.strip()]
+            except Exception:
+                self.history = []
+
+    def _save_history(self):
+        """Save command history to file."""
+        try:
+            os.makedirs(os.path.dirname(self.history_file), exist_ok=True)
+            with open(self.history_file, 'w') as f:
+                for cmd in self.history[-1000:]:
+                    f.write(cmd + '\\n')
+        except Exception:
+            pass
+
+    def run(self):
+        """Run the interactive session."""
+        print("\\nRegex Humanizer - Interactive Mode")
+        print("Type 'help' for available commands, 'quit' to exit.\\n")
+
+        while True:
+            try:
+                import click
+                user_input = click.prompt(
+                    "regex> ",
+                    type=str,
+                    default="",
+                    show_default=False
+                )
+
+                if not user_input.strip():
+                    continue
+
+                self.history.append(user_input)
+                self._save_history()
+
+                self._process_command(user_input.strip())
+
+            except (KeyboardInterrupt, EOFError):
+                print("\\nGoodbye!")
+                break
+
+    def _process_command(self, command: str):
+        """Process a user command."""
+        parts = command.split(None, 1)
+        cmd = parts[0].lower()
+        args = parts[1] if len(parts) > 1 else ""
+
+        commands = {
+            "help": self._cmd_help,
+            "quit": self._cmd_quit,
+            "exit": self._cmd_quit,
+            "explain": self._cmd_explain,
+            "test": self._cmd_test,
+            "flavor": self._cmd_flavor,
+            "set": self._cmd_flavor,
+            "load": self._cmd_load,
+            "save": self._cmd_save,
+            "history": self._cmd_history,
+            "clear": self._cmd_clear,
+            "example": self._cmd_example,
+        }
+
+        handler = commands.get(cmd)
+        if handler:
+            handler(args)
+        else:
+            print(f"Unknown command: {cmd}")
+            print("Type 'help' for available commands.")
+
+    def _cmd_help(self, args: str):
+        """Show help message."""
+        help_text = """
+Available Commands:
+  explain <pattern>  - Explain a regex pattern in English
+  test <pattern>     - Generate test cases for a pattern
+  flavor <name>      - Set the regex flavor (pcre, javascript, python)
+  set <name>         - Same as 'flavor'
+  load <filename>    - Load a pattern from a file
+  save <filename>    - Save the last pattern to a file
+  history            - Show command history
+  example            - Show an example pattern
+  clear              - Clear the screen
+  quit / exit        - Exit the interactive mode
+
+Examples:
+  explain ^\\d{3}-\\d{4}$
+  test [a-z]+
+  flavor javascript
+"""
+        print(help_text)
+
+    def _cmd_quit(self, args: str):
+        """Exit the session."""
+        print("Goodbye!")
+        sys.exit(0)
+
+    def _cmd_explain(self, args: str):
+        """Explain a regex pattern."""
+        if not args:
+            print("Usage: explain <pattern>")
+            return
+
+        try:
+            pattern = self._expand_pattern(args)
+            result = translate_regex(pattern, self.flavor)
+
+            header = f"Pattern: {pattern}"
+            print("\\n" + "=" * (len(header)))
+            print(header)
+            print("=" * (len(header)))
+            print("\\nEnglish Explanation:")
+            print("-" * (len(header)))
+            print(result)
+            print()
+
+        except Exception as e:
+            print(f"Error parsing pattern: {e}")
+
+    def _cmd_test(self, args: str):
+        """Generate test cases for a pattern."""
+        if not args:
+            print("Usage: test <pattern>")
+            return
+
+        try:
+            pattern = self._expand_pattern(args)
+            result = generate_test_cases(pattern, self.flavor, 3, 3)
+
+            header = f"Pattern: {pattern}"
+            print("\\n" + "=" * (len(header)))
+            print(header)
+            print("=" * (len(header)))
+            print(f"\\nFlavor: {self.flavor}")
+
+            print("\\nMatching strings:")
+            print("-" * (len(header)))
+            for i, s in enumerate(result["matching"], 1):
+                print(f"  {i}. {s}")
+
+            print("\\nNon-matching strings:")
+            print("-" * (len(header)))
+            for i, s in enumerate(result["non_matching"], 1):
+                print(f"  {i}. {s}")
+
+            print()
+
+        except Exception as e:
+            print(f"Error generating tests: {e}")
+
+    def _cmd_flavor(self, args: str):
+        """Set the current flavor."""
+        if not args:
+            manager = get_flavor_manager()
+            flavors = manager.list_flavors()
+            print("Available flavors:")
+            for name, desc in flavors:
+                marker = " (current)" if name == self.flavor else ""
+                print(f"  {name}{marker}: {desc}")
+            return
+
+        flavor_name = args.strip().lower()
+        manager = get_flavor_manager()
+
+        if manager.get_flavor(flavor_name):
+            self.flavor = flavor_name
+            print(f"Flavor set to: {flavor_name}")
+        else:
+            print(f"Unknown flavor: {flavor_name}")
+            print("Available flavors: pcre, javascript, python")
+
+    def _cmd_load(self, args: str):
+        """Load a pattern from a file."""
+        if not args:
+            print("Usage: load <filename>")
+            return
+
+        filename = args.strip()
+        if not os.path.exists(filename):
+            print(f"File not found: {filename}")
+            return
+
+        try:
+            with open(filename, 'r') as f:
+                pattern = f.read().strip()
+
+            print(f"Loaded pattern: {pattern}")
+
+            if hasattr(self, '_last_pattern'):
+                pass
+            self._last_pattern = pattern
+
+        except Exception as e:
+            print(f"Error reading file: {e}")
+
+    def _cmd_save(self, args: str):
+        """Save a pattern to a file."""
+        if not args:
+            print("Usage: save <filename>")
+            return
+
+        pattern = getattr(self, '_last_pattern', None)
+        if not pattern:
+            print("No pattern to save. Use 'explain' or 'test' first.")
+            return
+
+        try:
+            with open(args.strip(), 'w') as f:
+                f.write(pattern)
+            print(f"Saved pattern to: {args.strip()}")
+        except Exception as e:
+            print(f"Error writing file: {e}")
+
+    def _cmd_history(self, args: str):
+        """Show command history."""
+        print("Command history:")
+        for i, cmd in enumerate(self.history[-50:], 1):
+            print(f"  {i:3}. {cmd}")
+
+    def _cmd_clear(self, args: str):
+        """Clear the screen."""
+        os.system('cls' if os.name == 'nt' else 'clear')
+
+    def _cmd_example(self, args: str):
+        """Show an example pattern."""
+        examples = [
+            r"^\\d{3}-\\d{4}$",
+            r"[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$",
+            r"^(?:http|https)://[^\\s]+$",
+            r"\\b\\d{4}-\\d{2}-\\d{2}\\b",
+            r"(?i)(hello|hi|greetings)\\s+world!?",
+        ]
+
+        import random
+        example = random.choice(examples)
+        print(f"\\nExample pattern: {example}")
+        print("\\nType: explain " + example)
+        print("Type: test " + example)
+        print()
+
+    def _expand_pattern(self, pattern: str) -> str:
+        """Expand a pattern from history or args."""
+        return pattern
+
+
+def start_interactive_mode(flavor: str = "pcre"):
+    """Start the interactive mode."""
+    session = InteractiveSession(flavor=flavor)
+    session.run()