import re


def line_has_timing_data(line):
    """
    Determine whether the line has Verifier client timing data in it.

    >>> line_has_timing_data('   [0]: h2 is negotiated.')
    False
    >>> line_has_timing_data(' [1]: 2 transactions in 2 sessions (reuse 1) in 1790 milliseconds (0.1 / millisecond).')
    True
    >>> line_has_timing_data(r' [1]: 2 transactions in 2 sessions (reuse 1) in 1790 milliseconds (0.1 / millisecond).\\n')
    True
    """
    line_matcher = re.compile('.*transactions in .* sessions .* in .* milliseconds.*')
    return line_matcher.match(line) is not None