Real world Common Lisp

A simple Stardict client¹ in python², 21 lines with comments. How easy would it be to write an equivalent program in Common Lisp? I think Lisp is not suitable for practical problems.

import re, gzip, struct

idx_file = open('/usr/share/stardict/dic/quick_english-italian.idx', 'r').read()
dic = gzip.open('/usr/share/stardict/dic/quick_english-italian.dict.dz', 'r')

idx_re = r"([\w\W]+?)\x00([\w\W]{8})"

index = {word:struct.unpack('>ii', bytes)
          for (word, bytes) in re.findall(idx_re, idx_file)}

def lookup_word(word):
    if word not in index:
        return False
    pos, size = index[word]
    dic.seek(pos)
    result = dic.read(size)
    return result

while True:
    result = lookup_word(raw_input("Enter a word: "))
    print(result or "Word not found")

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1 - https://github.com/xiangfu/stardict/blob/master/doc/StarDictFileFormat
2 - Requires python 2.7

"Real World" CL looks like:

$ cat symcraft/data/units/die/unit.sym
range=666 show="death" say="dead" do=(act "remove" ?)

$ cat symcraft/data/units/human_barracks/unit.sym
layer=2 building=ye size=[3 3]
hp=800 armor=4
cost=["gold"=700 "wood"=450 "time"=200]
trains=["footman" "knight" "ballista"]

$ cat symcraft/data/fireball/unit.sym
layer=3 air=ye impact="explosion" cost=["mana"=100] damage=30 range=8 speed=6
splash=1 bounces=9

$