Re: negative look-ahead is ignored

Thanks, that explains why.
So I guess there is no way to force \d{1,3} to match first 3 digits, then 2 etc ?
I also tried the following regular expression (using "2005-122-")

\d{4}-(\d{3}|\d{2}|\d)(?!-)
[download]

but I noticed (using -Mre=debug) it doesn't change anything (allthough I really thought this would do the trick :)

LuCa

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Re^2: negative look-ahead is ignored by Sidhekin (Priest) on Feb 19, 2007 at 10:59 UTC
You might want to consider a negative lookahead on `\d` as well: `\d{4}-\d{1,3}(?![-\d])` [download] Of course, this means you won't match a string like `"2005-1222"` either. The original would match that, and if that's intentional, you need an even trickier version: `\d{4}-\d{1,3}(?!\d-)` [download] Here's betting one of these should be what you want. :-) `print "Just another Perl ${\(trickster and hacker)},"` The Sidhekin proves* Sidhe did it!	[reply] [d/l] [select]

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Re^2: negative look-ahead is ignored
by Sidhekin (Priest) on Feb 19, 2007 at 10:59 UTC

You might want to consider a negative lookahead on \d as well:

\d{4}-\d{1,3}(?![-\d])
[download]

Of course, this means you won't match a string like "2005-1222" either. The original would match that, and if that's intentional, you need an even trickier version:

\d{4}-\d{1,3}(?!\d*-)
[download]

Here's betting one of these should be what you want. :-)

print "Just another Perl ${\(trickster and hacker)},"
The Sidhekin proves Sidhe did it!

[reply]
[d/l]
[select]