regex - find the occurrences of particular string in give string? -

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Hi friends are now working in Perl. I need to check the string frequency in the set of arrays with the help of a pearl I can not but do anybody? 

  Open the file, "& lt;", "tab_name.txt" or $ !! My @ TabName = & lt; FILE & gt; My @ all_files = & lt; * & Gt; $ {$ _ = $ Tab; before my $ tab (@ tab name); My $ pgr = "PGR Usage"; If (m / $ pgr /) {for (my $ t = 0; scalar @all_files; $ t ++) {my $ file_name = 'PGR.csv'; $ _ = $ All_files [$ T]; If (m \ $ file_name \) {print $ file_name; }} Print "\ n $ tab \ n"; }}    
 
 
 Here's a problem:  
  The second part of the loop should be a condition such as:  
    
 For Code> (my $ t = 0; $ t & lt; @all_files; $ t ++) {  
 Your code will never end in writing.  
 However, it is much better:  
  foreach (@all_files) [  
 In addition, you have problems with your regex is. A variable in reggae is considered as a regular expression. .  matches a particular character. Thus, your code will match  PGR.csv , but it will also be  PGRacsv , etc. and it will also match those filenames where it is a part of the name, Like  FOO_PGR.csvblah . To resolve this:  
     
  •  Use the quote literally ( \ Q ... \ E ) to ensure that the file name is really behaved .  
  •  Anchors that match the beginning and end of the string ( ^ ,  $ )   
     In addition, backslashes are valid, but they are  
      m / ^ \ q $ file_name \ e $ /       
     In addition, you should put it at the top of each script that you write:  
      Use warnings; Strict use;

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