title: Find substring of a string using Batch file scripts
body: <p>I have filenames consisting of a number, a space and a name.  For example, <code>"023 filename1.txt"</code>.</p>
  
  <p>I want to create a Batch script which renames such files.  It needs to identify the sub-strings and remove everything before the space character.  For example, <code>"023 filename1.txt"</code> would be renamed to <code>"filename1.txt"</code>. </p>
  
  <p>Please explain how to do this in a Batch file.</p>