[PHP] Re: REGEX

On 11/09/15 16:40, Ron Piggott wrote:
>
> Hi Everyone.
>
> I've found this REGEX pattern at
> https://coderwall.com/p/snn1ag/regex-to-parse-your-default-nginx-access-logs
>
>
> (?P<ipaddress>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - -
> [(?P<dateandtime>\d{2}\/[a-z]{3}\/\d{4}:\d{2}:\d{2}:\d{2}
> (\+|\-)\d{4})\] ((\"(GET|POST) )(?P<url>.+)(http\/1\.1"))
> (?P<statuscode>\d{3}) (?P<bytessent>\d+) (["](?P<refferer>(\-)|(.+))["])
> (["](?P<useragent>.+)["])
>
> I am missing why it isn't parsing my access log file:
>
> 108.170.163.140 - - [11/Sep/2015:09:59:54 -0400] "GET
> /prayers-for-today/20 HTTP/1.0" 200 14982 "-" "Mozilla/5.0 (Linux;
> Android 5.0.1; GT-I9505 Build/LRX22C) AppleWebKit/537.36 (KHTML, like
> Gecko) Chrome/44.0.2403.133 Mobile Safari/537.36" "-"
>
> Would someone with a fresh set of eyes have a look for me please?
>
> This is the syntax where I use it:
>
> if (preg_match($pattern, $line, $matches)) {
>
> Thank you.
>
> Ron
>

Hello Ron,

I think you mixed 2 languages, PHP and Python.

I'm not into Python, but the part <snip>(?P<ipaddress></snip> isn't a
valid PHP regex. I have a gut feeling this is a Python declaration that
would store the match, if found, in a variable called 'ipaddress'

For example, the PHP equivalent of the above IP-address regex would be:
/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/

Or better,
/^[\s*]\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/ that forces the regex to
start at the beginning of the line, and catch any preceding whitespace
characters.

To get the matches saved, use
/(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})/

One tip: unless you're really experienced with regex'es, go 1 character
match at a time. I learned that the hard way :-)

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