{{alias}}( str, search )
    Returns the part of a string before a specified substring.

    Parameters
    ----------
    str: string
        Input string.

    search: string
        Search string.

    Returns
    -------
    out: string
        Substring.

    Examples
    --------
    > var str = 'beep boop';
    > var out = {{alias}}( str, ' ' )
    'beep'
    > out = {{alias}}( str, 'o' )
    'beep b'

    See Also
    --------
