title: regex failed to match using {M,N} on SunOS
body: <p>I have the following sample file and regular expression.</p>
  
  <p>testing.txt</p>
  
  <pre><code>testing                  aa
  a bc de
  e                        aa
  ba                        Z
  testing                  bb
  testing                  ac
  </code></pre>
  
  <p>my regular expression using egrep</p>
  
  <pre><code>egrep '[ ]{2,}' testing.txt
  </code></pre>
  
  <p>The above regular expression attempts to find contiguous white spaces in a line.
  However, the result returned is empty.</p>
  
  <p>the regulartion expression below works for 1 or more spaces. However that is not what I want.</p>
  
  <pre><code>egrep '[ ]+' testing.txt
  </code></pre>