Re: [PHP] regular expression question

Matthew Lasar wrote:

At 11:32 AM 8/31/2007, Per Jessen wrote:
Matthew Lasar wrote:

But I don't understand why the second half of the regular
expression works. I'm talking about this part:

@([-a-z0-9]+\.)+[a-z]{2,}/";

why is it able to detect repeated sections of the email address
after "@" that are separated by periods? like "@email.alaska.com" ..
It looks to me like it's only looking for one example of that
pattern. Does the "()" allow an unlimited number of patterns to
pass?

No, but the following '+' does.

But how? The +[a-z]{2,} seems to allow at least
two a-z clusters, but it doesn't include a period. /ml


That plus applies to the grouping () before it:

([-a-z0-9]+\.)+ one or more sequences of -a-z0-9 followed by a period



/Per Jessen, Zürich
.