lib/ramble/ramble/util/web.py [649:703]:
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        regexes.append(url_regex)

    # Build a dict version -> URL from any links that match the wildcards.
    # Walk through archive_url links first.
    # Any conflicting versions will be overwritten by the list_url links.
    versions = {}
    matched = set()
    for url in sorted(links):
        url = convert_to_posix_path(url)
        if any(re.search(r, url) for r in regexes):
            try:
                ver = spack.url.parse_version(url)
                if ver in matched:
                    continue
                versions[ver] = url
                # prevent this version from getting overwritten
                if reference_package is not None:
                    if url == reference_package.url_for_version(ver):
                        matched.add(ver)
                else:
                    extrapolated_urls = [
                        spack.url.substitute_version(u, ver) for u in archive_urls
                    ]
                    if url in extrapolated_urls:
                        matched.add(ver)
            except spack.url.UndetectableVersionError:
                continue

    for url in archive_urls:
        url = convert_to_posix_path(url)
        ver = spack.url.parse_version(url)
        if ver not in versions:
            versions[ver] = url

    return versions


def get_header(headers, header_name):
    """Looks up a dict of headers for the given header value.

    Looks up a dict of headers, [headers], for a header value given by
    [header_name].  Returns headers[header_name] if header_name is in headers.
    Otherwise, the first fuzzy match is returned, if any.

    This fuzzy matching is performed by discarding word separators and
    capitalization, so that for example, "Content-length", "content_length",
    "conTENtLength", etc., all match.  In the case of multiple fuzzy-matches,
    the returned value is the "first" such match given the underlying mapping's
    ordering, or unspecified if no such ordering is defined.

    If header_name is not in headers, and no such fuzzy match exists, then a
    KeyError is raised.
    """

    def unfuzz(header):
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lib/ramble/spack/util/web.py [655:709]:
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        regexes.append(url_regex)

    # Build a dict version -> URL from any links that match the wildcards.
    # Walk through archive_url links first.
    # Any conflicting versions will be overwritten by the list_url links.
    versions = {}
    matched = set()
    for url in sorted(links):
        url = convert_to_posix_path(url)
        if any(re.search(r, url) for r in regexes):
            try:
                ver = spack.url.parse_version(url)
                if ver in matched:
                    continue
                versions[ver] = url
                # prevent this version from getting overwritten
                if reference_package is not None:
                    if url == reference_package.url_for_version(ver):
                        matched.add(ver)
                else:
                    extrapolated_urls = [
                        spack.url.substitute_version(u, ver) for u in archive_urls
                    ]
                    if url in extrapolated_urls:
                        matched.add(ver)
            except spack.url.UndetectableVersionError:
                continue

    for url in archive_urls:
        url = convert_to_posix_path(url)
        ver = spack.url.parse_version(url)
        if ver not in versions:
            versions[ver] = url

    return versions


def get_header(headers, header_name):
    """Looks up a dict of headers for the given header value.

    Looks up a dict of headers, [headers], for a header value given by
    [header_name].  Returns headers[header_name] if header_name is in headers.
    Otherwise, the first fuzzy match is returned, if any.

    This fuzzy matching is performed by discarding word separators and
    capitalization, so that for example, "Content-length", "content_length",
    "conTENtLength", etc., all match.  In the case of multiple fuzzy-matches,
    the returned value is the "first" such match given the underlying mapping's
    ordering, or unspecified if no such ordering is defined.

    If header_name is not in headers, and no such fuzzy match exists, then a
    KeyError is raised.
    """

    def unfuzz(header):
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