Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things

Re^3: Strange regex to test for newlines: /.*\z/

by jettero (Monsignor)
on May 21, 2007 at 15:27 UTC ( #616590=note: print w/replies, xml ) Need Help??

in reply to Re^2: Strange regex to test for newlines: /.*\z/
in thread Strange regex to test for newlines: /.*\z/

It would work if you used $ instead. \z specifically asks for the end of the string and . won't match the \ns without a /s on the end. So .* and \z aren't adjacent in your first example — without the /s.

It probably would work with "\n" because .* could match 0 chars. But in your example, it already matched several chars before the \n which it refuses to slurp, so it (meaning the DFA) can't get to the \z at the end.

Of course, the more I think about it... you might argue that the .* should backtrack, skip over the \n and continue to match the 0 chars right before the \z. I believe \z has a special meaning though. It's not really matching characters. It's more of a border on things, like \b, so I suspect there really aren't 0 characters before it because it's not really there.

UPDATE: I'm completely convinced this is a bug based on "id-616551" below.


Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://616590]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (2)
As of 2016-10-24 04:29 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (302 votes). Check out past polls.