re_options = [
    r'(\.r\d+)?', # 1.1.2 or 1.1.2.r100
    r'c\d+', # 1.1c1 (setuptools)
    r'(b|beta)\d+?', # 1.1beta1 or 1.1b1 (webob, lxml, setuptools)
]
rx_options = [re.compile(r'[\d\.]+%s\Z'%re_opt) for re_opt in re_options]

def mark_stable(versions):
    # [ver] -> [(ver, is_stable)]
    for rx in rx_options:
        stable = [bool(rx.match(ver)) for ver in versions]
        if any(stable):
            break
    else:
        stable = [True] * len(versions)
    return zip(versions, stable)