Word Scrambler

import re
import random

def shuffle_middle(word: str) -> str:
    if len(word) <= 3:
        return word
    middle = list(word[1:-1])
    random.shuffle(middle)
    return word[0] + ''.join(middle) + word[-1]

def scramble_text(text: str) -> str:
    return re.sub(r"[a-zA-Z]+('s)?", lambda m: shuffle_middle(m.group()), text)

text = "The quick brown fox jumps over the lazy dog"
scrambled = scramble_text(text)
print("Original:", text)
print("Scrambled:", scrambled)
print()
print("Note: First and last letters are preserved.")
print("This is the Cambridge reading effect.")