Hi i feel we can do it in this way i have used my own example which is in the cookbook to explian it.

To generalise it better to find the N th match in a string, not just the first one. For example, you'd like to find the word preceding the third occurrence of "fish":

One fish two fish red fish blue fish

[download]

Solution

Use the /g modifier in a while loop, keeping count of matches:

   $WANT = 3;
   $count = 0;
   while (/(\w+)\s+fish\b/gi) 
    {
    if (++$count == $WANT) 
      {
        print "The third fish is a $1 one.\n";
        # Warning: don't `last' out of this loop
      }
    }

[download]
The third fish is a red one.

Or use a repetition count and repeated pattern like this:

  /(?:\w+\s+fish\s+){2}(\w+)\s+fish/i;

[download]

Code tags added by GrandFather

In reply to Re: Finding duplicate words in a paragraph by msk_0984
in thread Finding duplicate words in a paragraph by perladdict

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