@mutable_property<EOL><INDENT>def release_filter(self):<DEDENT>
return '<STR_LIT>'<EOL>
The repository's release filter (a string or regular expression, defaults to ``.*``).

The value of :attr:`release_filter` should be a string containing a
regular expression or the result of :func:`re.compile()`. The regular
expression is used by :attr:`Repository.releases` to match tags or
branches that signify "releases". If the regular expression contains a
single capture group, the identifier of a :class:`Release` object is
set to the substring captured by the capture group (instead of the
complete tag or branch name). This defaults to the regular expression
``.*`` which matches any branch or tag name.