On Thu, Jul 07, 2011 at 06:44:49AM -0500, Stan Hoeppner wrote:
> On 7/7/2011 5:58 AM, /dev/rob0 wrote:
> > The anchors at both ends mean you are safe. You start with ^ and
> > end with $, so nothing else can sneak in between those.
> >
> > A simpler expression to accomplish the same thing:
> > /^[0-9\.]$/ DUNNO
> > In English, that says: match a string which contains nothing but
> > numerals and dots. It matches nonsense strings such as "...", but
> > would be safe as per your intent to only match bare IP addresses.
>
> With that being right anchored, the last character it attempts to
> match is a dot, no? See a problem there?
The last character before $ is in fact "]" which closes the bracket
expression defined by the opening "[". Read up on character classes
and bracket expressions.
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