# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"^((?:[A-Za-z0-9!#$%&'*+\-\/=?^_`{|}~]|(?<=^|\.)\"|\"(?=$|\.|@)|(?<=\".*)[ .](?=.*\")|(?<!\.)\.){1,64})(@)((?:[A-Za-z0-9.\-])*(?:[A-Za-z0-9])\.(?:[A-Za-z0-9]){2,})$"
test_str = ("Valid email addresses\n\n"
"simple@example.com\n\n"
"very.common@example.com\n\n"
"disposable.style.email.with+symbol@example.com\n\n"
"other.email-with-hyphen@example.com\n\n"
"fully-qualified-domain@example.com\n\n"
"user.name+tag+sorting@example.com\n"
"(may go to user.name@example.com inbox depending on mail server)\n\n"
"x@example.com\n"
"(one-letter local-part)\n\n"
"example-indeed@strange-example.com\n\n"
"example@s.example\n"
"(see the List of Internet top-level domains)\n\n"
"\" \"@example.org\n"
"(space between the quotes)\n\n"
"\"john..doe\"@example.org\n"
"(quoted double dot)\n\n"
"=============================================================\n"
"Invalid email addresses\n\n"
"Abc.example.com\n"
"(no @ character)\n\n"
"A@b@c@example.com\n"
"(only one @ is allowed outside quotation marks)\n\n"
"a\"b(c)d,e:f;g<h>i[j\\k]l@example.com\n"
"(none of the special characters in this local-part are allowed outside quotation marks)\n\n"
"just\"not\"right@example.com\n"
"(quoted strings must be dot separated or the only element making up the local-part)\n\n"
"this is\"not\\allowed@example.com\n"
"(spaces, quotes, and backslashes may only exist when within quoted strings and preceded by a backslash)\n\n"
"this\\ still\\\"not\\\\allowed@example.com\n"
"(even if escaped (preceded by a backslash), spaces, quotes, and backslashes must still be contained by quotes)\n\n"
"1234567890123456789012345678901234567890123456789012345678901234+x@example.com\n"
"(local part is longer than 64 characters)")
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