# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"^(\S+) (?=(?s:.)*(\1.*)).*"
test_str = ("user1 jul/12/12\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user1 jul/12/12\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user3 jan/12/12\n"
"user1 jul/12/12\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user1 jul/12/12\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user1 jul/12/12\n"
"user6 aug/06/06\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user1 jul/12/12\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user1 aug/12/12\n"
"user5 feb/13/13\n"
"user1 dec/14/12\n"
"user1 jul/12/12\n"
"user5 jul/13/13\n"
"user1 jul/14/12\n"
"user2 jun/15/14")
matches = re.finditer(regex, test_str, re.MULTILINE)
for matchNum, match in enumerate(matches, start=1):
print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
for groupNum in range(0, len(match.groups())):
groupNum = groupNum + 1
print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html