'Parse iperf output and return bandwidth.
iperfOutput: string
returns: result string'

@staticmethod
def _parseIperf(iperfOutput):

    r = '([\\d\\.]+    \\w+/sec)'
    m = re.findall(r, iperfOutput)
    if m:
        return m[(-1)]
    else:
        error(('could    not    parse    iperf    output:    ' + iperfOutput))
        return ''
