1. I don't know, but you might look at Java.
  2. No idea, sorry.
  3. To get all the matches at once, use 
    my @matches = ( $line =~ m/$pattern/g )

    [download]
    (i.e., use the /g flag and assign the result to an array). If your problem is how to turn $filecontent into $line, then you want split. However—don't write your own regex; that's why we have Regexp::Common. (See Beast of the Number: Parsing the Feral Phone for why it's so scary to try to parse phone numbers.)

P.S. What kind of phone number is 5 digits followed by 6 digits?

In reply to Re: Few Doubts by JadeNB
in thread Few Doubts by mecrazycoder

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