Re: Re: A question on splitting

So, let me see if I can understand your regexg.

Split on "," if (0 or 1 occurances) (?) and if there is NOT (!) a space after ( ).

So, if I wanted to check for 1 or more spaces, would this be correct ?

split /,(?! +)/, $str
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Re: A question on splitting by Abigail-II (Bishop) on Jan 14, 2004 at 21:17 UTC
There's no need to check for more than one space. If a comma is followed by say 5 spaces, it's also followed by a space. There's only one character relevant here, and that's the character right after the comma. Abigail	[reply]
Re: Re: Re: A question on splitting by ysth (Canon) on Jan 14, 2004 at 22:14 UTC
Not quite. (?!pattern) is a special assertion that says the regex should only succeed if pattern would not match at that point (see perlre). So the regex has two parts: `,` (comma) and `(?! )` (not followed by a space). Note that `(?! )` (or it's positive counterpart `(?= )`) do not consume any part of the string. So /a(?=0)\d{2}/ applied to "a012" will match just "a01". Changing it to have a + doesn't affect anything, since if it has more than one space after the comma, it definitely has one space.	[reply] [d/l] [select]