in reply to Re^3: Splitting an url in its components
in thread Splitting an url in its components

this is great and exactly what I was looking for :-)

for my personal learning purposes:

I don't fully understand the expression "(?:tar\.gz|^.+)"

- what does the part '?:tar\.gz' mean?

thanks so far for your help
ben
  • Comment on Re^4: Splitting an url in its components

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Re^5: Splitting an url in its components
by moritz (Cardinal) on Jul 17, 2008 at 15:48 UTC
    There is no ?:tar\.gz part, because (?: ... ) has a distinct meaning (it's grouping without capturing), and tar\.gz just matches the string tar.gz.
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Re^5: Splitting an url in its components
by Anonymous Monk on Jul 18, 2008 at 04:44 UTC
    Use <c> code here </c> tags (Markup in the Monastery).

    Install YAPE::Regex::Explain, because 

    use YAPE::Regex::Explain;
print YAPE::Regex::Explain->new(qr~(?:tar\.gz|[^.]+)~)->explain;
__END__
The regular expression:

(?-imsx:(?:tar\.gz|[^.]+))

matches as follows:

NODE                     EXPLANATION
----------------------------------------------------------------------
(?-imsx:                 group, but do not capture (case-sensitive)
                         (with ^ and $ matching normally) (with . not
                         matching \n) (matching whitespace and #
                         normally):
----------------------------------------------------------------------
  (?:                      group, but do not capture:
----------------------------------------------------------------------
    tar                      'tar'
----------------------------------------------------------------------
    \.                       '.'
----------------------------------------------------------------------
    gz                       'gz'
----------------------------------------------------------------------
   |                        OR
----------------------------------------------------------------------
    [^.]+                    any character except: '.' (1 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
  )                        end of grouping
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------

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