Re: OT: grep and regex patterns

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On Thu, Jul 14, 2016 at 02:09:27AM +0000, Christopher wrote:
> On Wed, Jul 13, 2016, 21:11 Chris Adams <linux@xxxxxxxxxxx> wrote:
> 
> > Once upon a time, Mike Wright <nobody@xxxxxxxxxxxxxxxxxxxx> said:
> >
> > Putting all that together, I'd recommend:
> >
> >   PATTERN='https?://[^/]*\.in/'
> >   grep "$PATTERN" file.of.links > links.in

Minor nit, egrep is needed for the '?' or grep -E.

> >
> > or just:
> >
> >   grep 'https?://[^/]*\.in/' file.of.links > links.in
> >
> > Only potential oddity would be if you have URLs with non-standard ports
> > specified (like "https://foo.in:8080/";); to match that, you could use
> > egrep instead (extended regex):
> >
> >   egrep 'https://[^/]*\.in(:[0-9]+)?/' file.of.links > links.in
> 
> 
> One extra change I'd make, to make it more obvious you are checking for a
> literal dot and not intending to escape, use [.] instead of \.
> 
> So,
> 
> egrep 'https://[^/]*[.]in(:[0-9]+)?/' file.of.links > links.in

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Jon H. LaBadie                  jonfu@xxxxxxxxxx
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