title: Regular expression to extract data from a table in python
body: <p>I am new to regular expression and python:
  I have a data stored in a log file which I need to extract using regular expression. Below is the format :</p>
  
  <pre><code>#bytes #repetitions  t_min[usec]  t_max[usec]  t_avg[usec]
     0         1000         0.01         0.03         0.02
     4         1000       177.69       177.88       177.79
     8         1000       175.90       176.07       176.01
    16         1000       181.51       181.73       181.60
    32         1000       199.64       199.81       199.72
    64         1000       228.10       228.27       228.19
    28         1000       278.70       278.90       278.75
    256         1000       388.26       388.49       388.39
    512         1000       593.49       593.82       593.63
    1024         1000      1044.27      1044.90      1044.59
  </code></pre>