Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw

Re: Alternation in Effective Perl Programming Example

by chromatic (Archbishop)
on Dec 07, 2000 at 09:03 UTC ( #45445=note: print w/replies, xml ) Need Help??

in reply to Alternation in Effective Perl Programming Example

It's a little more than that. Should it be (?:\\\W|.) instead?

If so, as written, it would be interpreted as non-capturing parenthesis, matching either a backslash and a nonword character or a single character.

Otherwise, it's (an optional colon followed by a backslash and a non-word character) or (a single character).

  • Comment on Re: Alternation in Effective Perl Programming Example

Replies are listed 'Best First'.
Re: Re: Alternation in Effective Perl Programming Example
by a (Friar) on Dec 07, 2000 at 09:43 UTC
    Appears to be (looking at Effective perl) a typo, as the chapter leans heavily on (?: just before the example. You should mention it to merlyn as its not in the errata (neither is the misspelled 'Eart' on page 64 ;-)


      And, to the original question: I think the idea is to 'inch along'
      for (split m!("(?:\\\W|.)*?"|/\*|\*/)!) {
      will return the pieces ending w/ an escaped non-word char, a single char or the comment begin/end markers. Hmm, an escaped non-word char or a single char in quotes? No, as many \\\w|. as found between quotes. I guess so:
      biff = "not a comment /*"; /* marker for not a comment */
      won't start $in_comment too early.


Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://45445]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (9)
As of 2023-03-20 13:22 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (59 votes). Check out past polls.