import re

s = open('testo.txt').read()

print("espressione r'\\bil\\b[a-z0-9]*':")
i = re.finditer(r'\bil\b[a-z0-9]*', s)
for m in i:
    print(m.group())

print("espressione r'\\bil\\b [a-z0-9*':")
i = re.finditer(r'\bil\b [a-z0-9]*', s)
for m in i:
    print(m.group())