r'^email/(?P<email>[^@s]+@[^@s]+.[^@s]+)/$',

email/some_alphanumeric[A-Z0-9]_special_chars_@#$*some_alphanumeric_special_chars_#$*.some_alphanumeric_special_chars_#$*

myurl/email/blabla@blabla.com

myurl/email/([^@s]+@[^@s]+.[^@s]+)

# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility

import re

regex = r"myurl/email/([^@s]+@[^@s]+.[^@s]+)"

test_str = "myurl/email/blabla@blabla.com"

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.

r'^email/(?P<email>[^@s]+@[^@s]+.[^@s]+)/$'

email/ = consolent value in your url

[^@s] = you can write any character except @ and space "/s"
@[^@s] = you must start with @ + anything expect @character and space "/s"
. = matches "."
[^@s] = you can write anycharacter except @ and space "/s"
+ = you can type many character

/$ = end of url