regular expression (made more clearer)

From: Mandar Rahurkar (rahurkar_at_uiuc.edu)
Date: 05/29/04 

Date: Fri, 28 May 2004 20:52:43 -0500
To: James Edward Gray II <james@grayproductions.net>

Hi,
  I am trying to remove from file :
       1. all characters but any alphabet and numbers (i.e., file shd not contain anything
          but "alphabets and numbers" that means NO punctuation etc...
       2. all trailing spaces should be made to one space.
  
  following code doesnt seem to work for objective [1] mentioned above. Can anyone please point whats wrong with the
second line and what changes should I make ?

Thanks,
Mandar 

---
open(fp,$file) or die "Cant open $file :$!\n";
@cont=<fp>;
for(@cont) { 
 tr/A-Z/a-z/;             # converts all uppercase to lowercase   
 s/^[a-z0-9]+/ /;         # substitute all non alphabets and numbers by space
 s/\s+/ /g;               # removes trailing spaces
}   
--- 
-------------------
Mandar Rahurkar
ECE,   UIUC
-------------------

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