When asking regex questions, always add the tag for the specific programming language or tool (e.g., Perl, Python, or Java; vi, emacs, or ɢɴᴜ grep; etc.) you are using.
Questions tagged [regex]
720 questions
3
votes
2 answers
nginx rewrite regex for API versioning
What I want is for the first to be turned into the second..
/widget => /widget/index.php
/widget/ => /widget/index.php
/widget?act=list => /widget/index.php?act=list
/widget/?act=list =>…
MSpreij
- 85
- 1
- 9
3
votes
1 answer
Use of backreferences in fail2ban filters possible?
From time to time, I see collections of suspect "File not found" errors in my Apache logs, basically using the pattern
File does not exist: /var/www/file, referer: http://my.server.com/file
In human terms: The file was not found, though it…
Izzy
- 349
- 1
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3
votes
1 answer
How to make comments in logcheck files?
how can I add comments to logcheck ignore-rules?
Things I tried so far:
# seems to match single # characters instead of starting a comment
empty lines matches against everything
$ matches against everything
$^ seems to be an "impossible" regex,…
Black
- 188
- 1
- 13
3
votes
1 answer
Nginx - Redirect request by GET parameters pattern
One of my servers was attacked by DDoS a couple of days ago and it lasted for 4 days. Below are the logs snippet of the request:
36.224.180.253 - - [14/May/2013:03:11:46 +0800] "GET //?f5b2fd2f860dc=9597624054932145 HTTP/1.1" 301 178 "-" "Opera/9.80…
chr1x2
- 39
- 1
- 5
3
votes
1 answer
How to block all incoming proxy visits except from one specific I.P?
I have a page that is prone to attacks, so, in order to reduce the anonymous attacks, I use this code in my .htaccess which I found online :
# BLOCK PROXY VISITS
RewriteEngine on
RewriteCond %{HTTP:VIA} !^$…
user169759
3
votes
1 answer
How do I use "catchall" in my postfix alias?
I have this in my main.cnf:
alias_maps= regexp:/etc/aliases
Inside that file, I have:
/^reply*$/: jjj
Now, when I send it to reply-124233@mydomain.com, postfix bounces it because
Recipient address rejected: User unknown in local recipient…
Alex
- 8,471
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3
votes
1 answer
htaccess email regex
I am trying to write a patter in such a way that this link :
http://www.mysite.com/link/go/emailadress@gmail.com
is interpreted like this :
http://www.mysite.com/process.php?email=emailadress@gmail.com
But i dont know how to write. I tryied this but…
pollux1er
- 131
- 6
3
votes
2 answers
NGINX Reverse Proxy : proxy_cache inside if block - Possible?
I think starting with a small snippet would be wisest:
location ^~ /test/ {
proxy_pass http://frontend;
proxy_http_version 1.1;
proxy_set_header Connection "";
…
anonymous-one
- 1,018
- 7
- 27
- 43
3
votes
1 answer
Regular expression not working on Powershell
Background:
I need to match a multiline pattern(?) in a C# source file. The regular expression will be manipulate by Powershell. I have tested and it works on RegexBuddy (with the Dot Matches newline". But when I try to use it via powershell, it…
thugzclub
- 61
- 1
- 3
- 4
3
votes
1 answer
Fail2Ban SASL Filter Misses Failed Logins
I am using fail2ban on my mail server. I discovered this morning that there were some 5000 failed login attempts (in the course of 1 hour) via SMTP that didn't get picked up by my sasl filter. Here is an example of an entry in…
AJ.
- 332
- 4
- 14
3
votes
2 answers
How can I count instances of a regex match in a log file using PowerShell?
I have a very large log file in which I need to count the occurrences of all the variations of a particular string; that is:
There are a large number of file IDs that appear in the format AA000####. I have to find out what the top five or ten IDs…
Doug Chase
- 753
- 3
- 12
- 22
3
votes
2 answers
egrep matching group not printing?
I'm trying to create a bash script that will grep lines from a file using egrep. I've created the regex that should group the information I want, the issue is trying to get the output. I've been testing it with the following command but nothing is…
krizzo
- 387
- 2
- 5
- 16
3
votes
2 answers
apache question mark RewriteRule question
So i am trying to redirect from
index.php?action=search&query=search text goes here
to
search?query=search text goes here
i tried this so far but with no luck
RewriteRule ^search/? index.php?action=search&query=$1 [QSA,L]
EDIT : Solution…
stergosz
- 129
- 2
- 7
3
votes
2 answers
nginx location regex matches directory range
I am trying to set up nginx and I don't get the point how to do the following setup:
I have an URL http://somehost.com/foo/bar/123/xxx_xxx that needs to be passed to different backends depending on a range the '123' matches (e.g. 0-150 -> backend1,…
Sascha
- 538
- 2
- 5
- 12
3
votes
2 answers
Lex Flex variant that will do the Perl REGEX extensions
I use flex & lex a lot for stripping stuff from e-mail attachments in scritps. I wondered if there are moden versions and variants of the lex programs that have the perl REGEX extensions.
I know the boost libs support perl style but this is not…
kingchris
- 244
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- 13