Re: Re: Look Behind not work, please help

That's an interesting technique.

The split() call normally captures everything that doesn't match the regex; in this case, it's the unquoted parts. You add on a capture in the regex, which tells split to also keep the separators; in this case, it's the quoted parts. The non-obvious part is that split will interleave the captures-in-separators and the usual non-separator portions properly.

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Comment on Re: Re: Look Behind not work, please help

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Re: Re: Re: Look Behind not work, please help by jmcnamara (Monsignor) on Apr 30, 2003 at 15:32 UTC
Yes, it is one of the many interesting features of split, from the pod: `If the PATTERN contains parentheses, additional list elements are created from each matching substring in the delimiter. split(/([,-])/, "1-10,20", 3); produces the list value (1, '-', 10, ',', 20)` [download] Other interesting features of split are `LIMIT`, negative `LIMIT`, the parameter-less `split`, the difference between `' '`, `/ /` and `/\s+/` and the implicit split to `@_` when not in a list context (which is very useful in Golf). I used one of these features in Strip leading and trailing whitespace from a string.. -- John.	[reply] [d/l]

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Re: Re: Re: Look Behind not work, please help
by jmcnamara (Monsignor) on Apr 30, 2003 at 15:32 UTC

split

    If the PATTERN contains parentheses, additional
    list elements are created from each matching
    substring in the delimiter.

        split(/([,-])/, "1-10,20", 3);

    produces the list value

        (1, '-', 10, ',', 20)
[download]

Other interesting features of split are LIMIT, negative LIMIT, the parameter-less split, the difference between ' ', / / and /\s+/ and the implicit split to @_ when not in a list context (which is very useful in Golf).

I used one of these features in Strip leading and trailing whitespace from a string..

--
John.

[reply]
[d/l]