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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

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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.


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