How to use OR operator in findstr command from a windows 7 command prompt? -

The searchstrom is considered to support regular expressions and the way I am using it, let me test it For one or the file ends in ".exe" or ".dll" though I can not get the operation to work or '.' While using Windows, windows think that I am trying to pip the previous command and 'OR' is literally read or

Findstr.exe in the Windows system 32 directory only supports a very limited set of regular expression characters.

But to get the help displayed for this console application running in the prompt prompt window, findstr /? The result is going on,

for example a list file FileNames.lst for example

 in case of multiple search strings on the command line A simple or expression can be specified for the creation. 
  C: \ Program Files \ Internet Explorer \ ieproxy.dll C: \ Program Files \ Internet Explorer \ iexplore.exe C: \ Program Files \ Internet Explorer \ iexplore.exe.mui  < All file names ending with / pre> 
 and  .dll  or  .exe  should be case-insensitive  Findstr  command line This output can be output from: 
 
 % SystemRoot% \ system32 \ findstr.exe / I / R "\ .exe $ \ .dll $" FileNames.lst  For example rows in 
 
 output  FileNames.lst : 
 
  C: \ program file \ Internet Explorer \ ieproxy.dll C: \ Program Files \ Internet E Xplorer \ iexplore.exe  
 
 The regular expression in the search string is interpreted by the location  findstr  between a two wires a separator. Therefore, the  search  searches have regular expression string . Dll $  and . Search with Exe $  and return all the rows where one of the two exchanges matches the string. 
 
 For one or two or more regular expression strings a parameter  / C: "..." will be used multiple times on the command line, which is necessary when searching a regular expression The string contains 1 or more spaces, which should be included in the search expression as the literal character (s).  
 % SystemRoot% \ system32 \ findstr.exe / I / R / C: "\ .dll $" /C:"\.exe$ "FileNames.lst  
 
 The result is similar to the other command line. 
 
 But this specific task is not required to run any regular expression search because  Searchstric  also parameters  / E  return only those rows Provides where the detected strings meet at the end of the line. 
 
 % SystemRoot% \ system32 \ searchstr.exe / E / I /C:.exe /C:.dll filename. Lst