title: split row names with multiple delimiter in to separate column
body: <p>How can i split the row names in my data frame which are separated by multiple delimiter in to separate columns.</p>
  
  <pre><code>df1 &lt;-  
                                     test1                  test2
          1:740001-760000                 1                -1
          1:760001-780000                 1                -1
          1:780001-800000                 1                -1
          1:800001-820000                 1                -1
          1:840001-860000                 1                -1
          1:860001-880000                 1                -1
  </code></pre>
  
  <p>expected output</p>
  
  <pre><code>    Chr    Start   End                 test1            test2
      1      740001 760000                 1                -1
      1      760001 780000                 1                -1
      1      780001 800000                 1                -1
      1      800001 820000                 1                -1
      1      840000 860000                 1                -1
      1      860001 880000                 1                -1
  </code></pre>