{{alias}}( [platform] )
    Returns a regular expression to capture a filename extension.

    The regular expression is platform-dependent. If the current process is
    running on Windows, the regular expression is `*.REGEXP_WIN32`; otherwise,
    `*.REGEXP_POSIX`.

    Parameters
    ----------
    platform: string (optional)
        Path platform (either `posix` or `win32`).

    Returns
    -------
    re: RegExp
        Regular expression.

    Examples
    --------
    > var RE = {{alias}}()
    <RegExp>
    > var RE_POSIX = {{alias}}( 'posix' );
    > var ext = RE_POSIX.exec( '/foo/bar/index.js' )[ 1 ]
    '.js'
    > var RE_WIN32 = {{alias}}( 'win32' );
    > ext = RE.exec( 'C:\\foo\\bar\\index.js' )[ 1 ]
    '.js'
    > var str = RE.toString();
    > var bool = ( str === RE_POSIX.toString() || str === RE_WIN32.toString() )
    true


{{alias}}.REGEXP
    Regular expression to capture a filename extension.

    Examples
    --------
    > var RE = {{alias}}.REGEXP
    <RegExp>


{{alias}}.REGEXP_POSIX
    Regular expression to capture a POSIX filename extension.

    Examples
    --------
    > var ext = {{alias}}.REGEXP_POSIX.exec( '/foo/bar/index.js' )[ 1 ]
    '.js'


{{alias}}.REGEXP_WIN32
    Regular expression to capture a Windows filename extension.

    Examples
    --------
    > var ext = {{alias}}.REGEXP_WIN32.exec( 'C:\\foo\\bar\\index.js' )[ 1 ]
    '.js'

    See Also
    --------