[squid-users] correct regular expression to use to capture all

[robert k Wild]

So will this

(^|\.)redshift3d\.com$

I know it will match

Blah.redshift3d.com and
redshift3d.com

But what about

Blah.Blah.redshift3d.com

On Sat, 8 Jul 2023, 22:32 Alex Rousskov, <rousskov at measurement-factory.com>
wrote:

> On 7/8/23 06:14, Stuart Henderson wrote:
> > On 2023-07-07, robert k Wild <robertkwild at gmail.com> wrote:
> >> --===============6398075081121841451==
> >> Content-Type: multipart/alternative;
> boundary="000000000000a03dcc05ffeb4428"
> >>
> >> --000000000000a03dcc05ffeb4428
> >> Content-Type: text/plain; charset="UTF-8"
> >>
> >> hi all,
> >>
> >> i know ive been talking about this before but i want to understand why i
> >> cant use this regex
> >>
> >> (^|.*)redshift3d.com$
> >
> > this matches anythingredshift3d[any single character or nothing]com
>
> Correction: A regular expression "." does _not_ match "nothing" (i.e.
> zero characters).
>
> In some contexts, "." may not even match some special single characters,
> but those contexts are probably not applicable to this thread scope.
>
>
> >> instead i have to use this
> >>
> >> (^|\.)redshift3d.com$ OR
> >
> > this matches redshift3d[any single character or nothing]com
> > or anything.redshift3d[any single character or nothing]com
>
> ... or .redshift3d.com
>
> Same "nothing" correction here.
>
>
> >> (^|\.)redshift3d\.com$
> >
> > this only matches redshift3d.com or anything.redshift3d.com
>
> ... or .redshift3d.com
>
>
> Alex.
>
>
> > So, if you only want to match on things exactly in the redshift3d.com
> > domain and no others, you need the last one.
>
>
>
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