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

[Stuart Henderson]

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

> 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

> (^|\.)redshift3d\.com$

this only matches redshift3d.com or anything.redshift3d.com

So, if you only want to match on things exactly in the redshift3d.com
domain and no others, you need the last one.