import re
import fileinput
pat = re.compile('From: (.*) <.*?>$')
for line in fileinput.input("ab.txt"):
m = pat.match(line)
if m:
print(m.group(1))
import re
import fileinput
pat = re.compile('From: (.*) <.*?>$')
for line in fileinput.input("ab.txt"):
m = pat.match(line)
if m:
print(m.group(1))