import re


def is_issue(text):
    """
    Does this token look like an issue reference?
    https://help.github.com/articles/autolinked-references-and-urls/#issues-and-pull-requests

    >>> is_issue('26')
    False
    >>> is_issue('#26')
    True
    >>> is_issue('jlord#26')
    True
    >>> is_issue('jlord')
    False
    >>> is_issue('jlord/sheetsee.js')
    False
    >>> is_issue('jlord/sheetsee.js#26')
    True
    """
    return bool(re.match(r'''
        (?: (?:[\w.-]+/)?   # Owner
               [\w.-]+)?    # Repository
        [#]\d+$             # Issue number
    ''', text, re.VERBOSE | re.UNICODE))