title: Regex Crash on pattern
body: <p>If I try to match data of the form</p>
  
  <pre><code>6.0, 10.64, 5.23, 6.66, 0.81, 30, 0.002304, 0.000267, 1.0, 9.549297, 12.604, 12.258, 0.714172
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 0.000829, 0.00014, 2.0, 19.098593, 24.036, 23.266, 2.723789
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 0.000369, 9.5e-05, 3.0, 28.64789, 35.49, 34.25, 6.032778
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 0.000207, 7.4e-05, 4.0, 38.197186, 45.535, 43.987, 10.320451
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 0.000164, 6.1e-05, 5.0, 47.746483, 55.276, 53.18, 15.660281
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 0.000144, 5.3e-05, 6.0, 57.29578, 64.029, 61.729, 21.767831
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 9.2e-05, 4.6e-05, 7.0, 66.845076, 74.073, 71.162, 29.379847
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 7.7e-05, 4.1e-05, 8.0, 76.394373, 83.119, 79.763, 37.677382
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 6.4e-05, 3.7e-05, 9.0, 85.943669, 92.484, 88.643, 47.162835
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 5.2e-05, 3.3e-05, 10.0, 95.492966, 102.025, 97.861, 57.808909
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 3.1e-05, 2.4e-05, 15.0, 143.239449, 144.605, 138.215, 122.904018
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 1.6e-05, 1.8e-05, 20.0, 190.985932, 189.013, 179.673, 214.196754
  6.0, 10.64, 5.23, 6.66, 0.81, 30, 1e-05, 1.5e-05, 25.0, 238.732415, 231.256, 219.497, 327.58412
  </code></pre>
  
  <p>line by line (via findall) using 13 instances of <code>([-]?[\.\d]*[eE]?[-]?[\.\d]*),</code> &lt;-note ,+space at the end except for the last one</p>
  
  <pre><code>([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*), ([-]?[\.\d]*[eE]?[-]?[\.\d]*)
  </code></pre>
  
  <p>regex locks up or crashes. If I try to match 12 iterations, it works fine. I don't understand why matching 12 numbers is ok but matching 13 is instant death. Anyone know what is going on here? Note that while the data set here doesn't happen to have scientific notation in all columns it can happen, hence why I put in a match for all the columns.</p>