Well you can go for this, this change is required in your first line of code:

if($line =~ m/^Width(\s*)\=(\s*)(\d*)/)#to match width
[download]

Please go through Regular Expressions tutorials for a better understanding, these are very simple search techniques This is my program

$line = 'Width = 32 <uart0_rx_data : 16\'h0000> Descr - "This is Regis
+ter1 comment" f_name    bit_pos  RESERVED    31:8  RXDATA        5:0 
+  </uart0_rx_data>';
if($line =~ m/^Width(\s*)\=(\s*)(\d*)/) # to match Width
{
  print "something";
}
elsif ($line =~ m/^Descr[\s]*-[\s]*[\w]+$/) # to match Descr
{
  print "noone";
}
else
{
  printf "Garbage found: \"%s\" \n",$line;
}
[download]

UPDATE:: So, WW I haven't said that this is the only way there are lots of way to do things in perl. Secondly, I didn't say that what you need to print the width value. Yes $3 will give the exact output, while you are completely wrong on the statement that it will not match ) after equal to. Check it and then say.

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.