Re: Re: How to do it in one line?

I don't suppose that someone would consider explaining how this works for me?

I spent a couple of hours on trying to understand this in conjunction with perlman:perlre and I am frankly lost.

Comment on Re: Re: How to do it in one line?

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Re: How to do it in one line? by Abigail-II (Bishop) on Jul 08, 2002 at 16:28 UTC
`s/(\G # Either were we finished the previous time # (or at the beginning the first time). \| # Or (.)(?!\2)) # A character ($2) not followed by itself ( # Capture ($3) (.)\4(?!\4) # A character ($4) followed exactly once by + itself. ) # End capture ($3) /$2($3)/xg # Replace with $2 (what preceeded) followed + by # "($3)" (the duplicate).` [download] It boils down to that if you have exactly two occurances of a character, something else should preceed those chararcters, or they should be at the beginning of the string (or were we left off the previous time). Abigail	[reply] [d/l]

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Re: How to do it in one line?
by Abigail-II (Bishop) on Jul 08, 2002 at 16:28 UTC

   s/(\G                  #  Either were we finished the previous time
                          #     (or at the beginning the first time).
       |                  #  Or
      (.)(?!\2))          #  A character ($2) not followed by itself
     (                    #  Capture ($3)
      (.)\4(?!\4)         #  A character ($4) followed exactly once by
+ itself.
     )                    #  End capture ($3)
    /$2($3)/xg            #  Replace with $2 (what preceeded) followed
+ by
                          #  "($3)" (the duplicate).
[download]

Abigail

[reply]
[d/l]