How to use the pycodestyle.DOCSTRING_REGEX function in pycodestyle

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

top_level_lines = 3
    method_lines = 2
    if line_number < 3 and not previous_logical:
        return  # Don't expect blank lines before the first line
    if previous_logical.startswith('@'):
        if blank_lines:
            yield 0, "E304 blank lines found after function decorator"
    elif (
        (blank_lines > top_level_lines + 1) or
        (indent_level and blank_lines == method_lines + 1)
            ):
        yield 0, "E303 too many blank lines (%d)" % blank_lines
    elif pycodestyle.STARTSWITH_TOP_LEVEL_REGEX.match(logical_line):
        if indent_level:
            if not (blank_before or previous_indent_level < indent_level or
                    pycodestyle.DOCSTRING_REGEX.match(previous_logical)):
                ancestor_level = indent_level
                nested = False
                # Search backwards for a def ancestor or tree root (top level).
                for line in lines[line_number - 2::-1]:
                    if (
                        line.strip() and
                        pycodestyle.expand_indent(line) < ancestor_level
                            ):
                        ancestor_level = pycodestyle.expand_indent(line)
                        nested = line.lstrip().startswith('def ')
                        if nested or ancestor_level == 0:
                            break
                if nested:
                    yield 0, "E306 expected 1 blank line before a " \
                        "nested definition, found 0"
                else:

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')

def extended_blank_lines(logical_line,
                         blank_lines,
                         blank_before,
                         indent_level,
                         previous_logical):
    """Check for missing blank lines after class declaration."""
    if previous_logical.startswith('def '):
        if blank_lines and pycodestyle.DOCSTRING_REGEX.match(logical_line):
            yield (0, 'E303 too many blank lines ({0})'.format(blank_lines))
    elif pycodestyle.DOCSTRING_REGEX.match(previous_logical):
        # Missing blank line between class docstring and method declaration.
        if (
            indent_level and
            not blank_lines and
            not blank_before and
            logical_line.startswith(('def ')) and
            '(self' in logical_line
        ):
            yield (0, 'E301 expected 1 blank line, found 0')