import re
pattern = r"^efgh\b(?!\.).*"
s = ("abcd|123|ABCD|112233|\n"
"abcd|234|ABCD|112233|\n"
"abcd.abc|123|ABCD|112233|\n"
"efgh|234|EFGH|445566|\n"
"efgh|4567|EFGH|445566|\n"
"efgh.abc|6789|EFGH|445566|\n"
"efgh.abc|4567|EFGH|445566|\n"
"xyz|567|XYZ|557799|\n"
"xyz.abc|567|XYZ|557799|")
print(re.findall(pattern, s, re.M))
aW1wb3J0IHJlCgpwYXR0ZXJuID0gciJeZWZnaFxiKD8hXC4pLioiCgpzID0gKCJhYmNkfDEyM3xBQkNEfDExMjIzM3xcbiIKCSJhYmNkfDIzNHxBQkNEfDExMjIzM3xcbiIKCSJhYmNkLmFiY3wxMjN8QUJDRHwxMTIyMzN8XG4iCgkiZWZnaHwyMzR8RUZHSHw0NDU1NjZ8XG4iCgkiZWZnaHw0NTY3fEVGR0h8NDQ1NTY2fFxuIgoJImVmZ2guYWJjfDY3ODl8RUZHSHw0NDU1NjZ8XG4iCgkiZWZnaC5hYmN8NDU2N3xFRkdIfDQ0NTU2NnxcbiIKCSJ4eXp8NTY3fFhZWnw1NTc3OTl8XG4iCgkieHl6LmFiY3w1Njd8WFlafDU1Nzc5OXwiKQoKcHJpbnQocmUuZmluZGFsbChwYXR0ZXJuLCBzLCByZS5NKSk=