Hey Bernd,
I remember my first head scratches with regex, they can be so
confusing and difficult to understand.
Although I remember preciously the day https://regexone.com/ opened my
eyes. It just took me 45 minutes to understand the basics of it.
I dearly recommend you to do the same and visit the site, once you
grasp it, regex will be tones of times easier to deal with.
Cheers
El mar, 15 dic 2020 a las 17:42, Lentes, Bernd
(<bernd.lentes@xxxxxxxxxxxxxxxxxxxxx>) escribió:
>
>
> ----- On Dec 11, 2020, at 4:13 PM, Eric Covener covener@xxxxxxxxx wrote:
>
> > On Fri, Dec 11, 2020 at 10:06 AM Lentes, Bernd
> > <bernd.lentes@xxxxxxxxxxxxxxxxxxxxx> wrote:
> >>
> >> ----- On Dec 9, 2020, at 6:02 PM, Eric Covener covener@xxxxxxxxx wrote:
> >>
> >> Hi Eric,
> >>
> >> thanks for your answer.
> >> Now i'm struggling with RewriteRule
> >> ^(?:build|tests|config|lib|3rdparty|templates)/.* - [R=404,L]
> >>
> >> Most is clear. The content of the parentheses () like build, tests .. is
> >> or-conjuncted by the pipe |,
> >> so only one of the patterns must appear.
> >> But what is ?: ?
> >
> > It makes the () "non-capturing" meaning if you had other () sequences
> > this or-conjunction would not eat up $1.
> > In the case above it is unnecessary since there is no other capture.
> >
> >> The question mark normally is a repeater for the prior character. But there is
> >> no one.
> >> And wherefore is the colon ?
> >
> > It's a special case when following "(". It allows the
> > matching/capturing to be customized a few different ways (man
> > pcresyntax has a concise list of the flags that follow "(?")
> >
> >> I gave https://perldoc.perl.org/perlre#Metacharacters a chance. It seems the ?:
> >> says that a match for (build|tests|config|lib|3rdparty|templates)
> >> can't be used as a backreference. Right ? Where is the purpose of that ?
> >
> > yes, just to avoid eating up $1. But some people do it out of habit
> > when they use () just to group "|".
> >
> >
> >> in my error_log with setting "LogLevel info rewrite:trace2":
> >> [Fri Dec 11 15:44:50.666869 2020] [rewrite:trace1] [pid 3408]
> >> mod_rewrite.c(483): [client 146.107.126.166:57329] 146.107.126.166 - -
> >> [nc-mcd.helmholtz-muenchen.de/sid#7f9158e4f700][rid#7f9155a2a0a0/initial]
> >> [perdir /var/www/nextcloud/] pass through /var/www/nextcloud/
> >>
> >> What is sid and rid ?
> >
> > server (vhost) id and request id i believe. Usually not so useful.
> > The /initial meant it's not a "subrequest" (a way apache modules
> > sometimes make an internal request related to the real request to
> > probe for things)
> >
>
> Hi,
>
> some more questions:
>
> 1. What is if a rule matched and a substitution occured ? When there are following rules, they are compared with the substitution, right ?
> 2. What is if a rule matched and a substitution occured ? Does Apache continues with the next rule or does it start from scratch with the first rule again ?
> 3. Let's assume we have a vhost with a conf file, and in the documentroot of the vhost a .htaccess file. In both files are RewriteRules.
> In which order are they processed ?
>
>
> Bernd
> Helmholtz Zentrum München
>
> Helmholtz Zentrum Muenchen
> Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH)
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> 85764 Neuherberg
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>
>
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--
Daniel Ferradal
HTTPD Project
#httpd help at Freenode
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