I'm trying to get grouped matches from the following URI:
route: "/user/{user}/{action}"
input: "/user/someone/news"
What's the appropriate regex for this? I've been searching myself sour for the past couple of hours...
I've tried something like this, but no result :(
~\/app\/user\/(?P<user>[.*]+)\/(?P<action>[.*]+)~
I get the groups back in the matches array, but no results based on the input inside the groups.
Desired output:
Array
(
[0] => Array
(
[0] => "someone"
)
[user] => Array
(
[0] => "someone"
)
[1] => Array
(
[0] => "news"
)
[action] => Array
(
[0] => "news"
)
)
To clarify with an example:
My controller has the following route: /app/user/{username}/{action}
The request URI from the browser is: /app/user/john/news
How do I match that request URI against that route using a regex patter while catching the variables between the brackets?
/user/(?P<user>[^/]+)/(?P<action>[^/]+)
http://regex101.com/r/gL1aS2
Just to explain a couple problems with your original regex:
[.*]+ means a positive number of occurrences of a dot and an asterisk only, example: *.*.* or . or ......; [^/]+ describes a positive number of any characters but slashes.
No need to escape slashes, as they're not special characters when you're using ~ as delimiters.
Your regex also required /app at the beginning, which wasn't present in your string.
Related
I have a string with multiple tags in as so:
<item>foo bar</item> <item>foo bar</item>
I need to match each of these and they can be on new lines and add them to an array, it can't seem to match them though, I'm new to regex so I'm not understanding what is going wrong, an explanation would be great, thanks!
preg_match_all('/<item>(.*)<\/item>/',$content,$matches);
At the moment, it returns two empty index in the matches array.
I have also tried:
<item>([\s\S]*)<\/item>
This matches from the first tag until the very last one, so grabs everything essentially.
You can use this
preg_match_all('/<item>(.*?)<\/item>/',$content,$matches);
Result
Array
(
[0] => Array
(
[0] => <item>foo bar</item>
[1] => <item>foo bar</item>
)
[1] => Array
(
[0] => foo bar
[1] => foo bar
)
)
I only added ? to the regex, that looks for the nearest match and get it.
Read about lazy and greedy here: What do lazy and greedy mean in the context of regular expressions?
i have a problem with preg_match , i cant figure it out.
let the code say it :
function::wp_statistics_useronline::end
function::wp_statistics_visitor|today::end
function::wp_statistics_visitor|yesterday::end
function::wp_statistics_visitor|week::end
function::wp_statistics_visitor|month::end
function::wp_statistics_visitor|total::end
these are some string that run functions inside php;
when i use just one function::*::end it works just fine.
but when it contain more than one function , not working the way i want
it parse the match like :
function::wp_statistics_useronline::end function::wp_statistics_visitor|today::end AND ....::end
so basically i need Regex code that separate them and give me an array for each function::*::end
I assume you were actually using function::(.*)::end since function::*::end is never going to work (it can only match strings like "function::::::end").
The reason your regex failed with multiple matches on the same line is that the quantifier * is greedy by default, matching as many characters as possible. You need to make it lazy: function::(.*?)::end
It's pretty straight forward:
$result = preg_match_all('~function::(\S*)::end~m', $subject, $matches)
? $matches[1] : [];
Which gives:
Array
(
[0] => wp_statistics_useronline
[1] => wp_statistics_visitor|today
[2] => wp_statistics_visitor|yesterday
[3] => wp_statistics_visitor|week
[4] => wp_statistics_visitor|month
[5] => wp_statistics_visitor|total
)
And (for the second example):
Array
(
[0] => wp_statistics_useronline
[1] => wp_statistics_visitor|today
)
The regex in the example is a matching group around the part in the middle which does not contain whitespace. So \S* is a good fit.
As the matching group is the first one, you can retrieve it with $matches[1] as it's done after running the regular expression.
This is what you're looking for:
function\:\:(.*?)\:
Make sure you have the dot matches all identifier set.
After you get the matches, run it through a forloop and run an explode on "|", push it to an array and boom goes the dynamite, you've got what you're looking for.
I have the following LaTeX command:
\autocites[][]{}[][]{}
where the parameters inside [] are optional the others inside {} are mandatory. The \autocites command can be extended by additional groups of arguments like:
\autocites[a1][a2]{a3}[b1][b2]{b3}
\autocites[a1][a2]{a3}[b1][b2]{b3}[c1][c2]{c3}
...
It can also be used like this:
\autocites{a}{b}
\autocites{a}[b1][]{b3}
\autocites{a}[][b2]{b3}
...
I'd like to extract its parameters by using a regular expression in PHP. This is my first attempt:
/\\autocites(\[(.*?)\])(\[(.*?)\])(\{(.*?)\})(\[(.*?)\])(\[(.*?)\])(\{(.*?)\})/
Although this works fine if \autocites contains only two groups of three parameters I'm not able to figure out how to get it working for an unknown number of parameters.
I also tried using the following expression:
/\\autocites((\[(.*?)\]\[(.*?)\])?\{(.*?)\}){2,}/
This time I'm able to match even larger numbers of parameters but then I'm not able to extract all values because PHP always just gives me the content of the last three parameters:
Array
(
[0] => Array
(
[0] => \autocites[a][b]{c}[d][e]{f}[a][a]{a}
)
[1] => Array
(
[0] => [a][a]{a}
)
[2] => Array
(
[0] => [a][a]
)
[3] => Array
(
[0] => a
)
[4] => Array
(
[0] => a
)
[5] => Array
(
[0] => a
)
)
Any help is greatly appreciated.
You'll have to do this in two steps. Only .NET can retrieve an arbitrary amount of captures. In all other flavors, the amount of resulting captures is fixed by the number of groups in your pattern (repeating a group will only overwrite previous captures).
So first, match the entire thing to get the parameters, and then extract them in a second step:
preg_match('/\\\\autocites((?:\{[^}]*\}|\[[^]]*\])+)/', $input, $autocite);
preg_match_all('/(?|\{([^}]*)\}|\[([^]]*)\])/', $autocite[1], $parameters);
// $parameters[1] will now be an array of all parameters
Working demo.
Using a slightly more elaborate approach and the anchor \G we could also do it all in one go, by using an arbitrary amount of matches instead of captures:
preg_match_all('/
(?| # two alternatives whose group numbers both begin at 1
\\\\autocites # match the command
(?|\{([^}]*)\}|\[([^]]*)\])
# and a parameter in group 1
| # OR
\G # anchor the match to the end of the last match
(?|\{([^}]*)\}|\[([^]]*)\])
# and match a parameter in group 1
)
/x',
$input,
$parameters);
// again, you'll have an array of parameters in $parameters[1]
Working demo.
Note that with this approach - if you have multiple autocites in your code, you'll get all parameters from all commands in a single list. There are some ways alleviate that, but I think the first approach would be cleaner in that case.
If you want to be able to distinguish between optional and mandatory parameters (with any approach), capture the opening or closing bracket/brace along with the parameter, and check against that character to find out which type it is.
I'm trying to create a url handler and I tried to use preg_match for finding the variables.
So here is the preg_match that I get after the variable replacing of the url format (ex:post/%id%/%title%) -
preg_match("/post\/[0-9]+\/[a-z-א-ת-]+/i","post/5/lol",$match);
My problem that $match returns only this inside array -
"post/5/lol"
And not an array like that -
Array (
[0] => "post/5/lol",
[1] => "5",
[2] => "lol"
)
Can someone help me please to find out why it returns only one match?
Wrap each segment you wish to capture with parentheses, creating sub-expressions:
preg_match("/post\/([0-9]+)\/([a-z-א-ת-]+)/i", "post/5/lol", $match);
I do not know why there are 2 matches found aside from the input using this regex, when I expected only 1 match.
preg_match(/_(\d(-\d){0,3})\./,$str,$matches);
on this file string format name_A-B-C-D.ext.
I would expect to get a single match like this:
Example A
[0] => name_A-B-C-D.ext
[1] => A-B-C-D
Example B
[0] => name_A-B-C.ext
[1] => A-B-C
But this is the result I get:
Example A
[0] => name_A-B-C-D.ext
[1] => A-B-C-D
[2] => -D
Example B
[0] => name_A-B-C.ext
[1] => A-B-C
[2] => -C
I only wish to capture A up to D if its preceded with a hyphen.
This code is usable and I can simply ignore the 2nd match, but I would like to know why its there. I can only assume it has something to do with my two capture groups. Where is my error ?
Yes, you get two captures because you have two capturing groups in your regular expression.
To avoid the unwanted capture you could use a non-capturing group (?:...):
/_(\d(?:-\d){0,3})\./
I can only assume it has something to do with my two capture groups.
Your assumption is correct
Where is my error ?
There is no error, everything is behaving as expected.
You have to groups in your RE, so you get 2 matches. What is surprising?
Each pair of parenthesis is a group.