import re


def is_release_identifier(text):
    """
    >>> is_release_identifier('utf-8')
    False
    >>> is_release_identifier('killbill-0.1.66')
    True
    >>> is_release_identifier('jargo-parent-0.1.1')
    True
    """

    return bool(re.match(r'''
        [\w\-_]+
        # Copy-pasted is_version_number() regex
        \d+              # Major number
        (?: [.] \d+)?    # Minor number
            [.] \d+      # Patch number
        (?: [\-.](?:\w+|rc[.]?\d+))*  # Tag
    ''', text, re.VERBOSE))