Regular expression to extract annotation parameter - php

Question

i want to extract parameter like exist in annotation
i have done this far
$str = "(action=bla,arg=2,test=15,op)";
preg_match_all('/([^\(,]+)=([^,\)]*)/', $str, $m);
$data = array_combine($m[1], $m[2]);
var_dump($data);
this gives following out put
array (size=3)
'action' => string 'bla' (length=3)
'arg' => string '2' (length=1)
'test' => string '15' (length=2)
this is ignoring op (but i want it having null or empty value)
but i want to improve this so it can extract these also
(action='val',abc) in this case value inside single quote will assign to action
(action="val",abc) same as above but it also extract value between double quote
(action=[123,11,23]) now action action will contain array 123,11,23 (this also need to extract with or without quotation)
i don't want complete solution(if you can do it then most welcome) but i need at least first two
EDIT
(edit as per disucssion with r3mus)
output should be like
array (size=3)
'action' => string 'bla' (length=3)
'arg' => string '2' (length=1)
'test' => string '15' (length=2)
'op' => NULL

Answer 1

Edit:
This ended up being a lot more complex than just a simple regex. It ended up looking (first pass) like this:
function validate($str)
{
if (preg_match('/=\[(.*)\]/', $str, $m))
{
$newstr = preg_replace("/,/", "+", $m[1]);
$str = preg_replace("/".$m[1]."/", $newstr, $str);
}
preg_match('/\((.*)\)/', $str, $m);
$array = explode(",", $m[1]);
$output = array();
foreach ($array as $value)
{
$pair = explode("=", $value);
if (preg_match('/\[(.*)\]/', $pair[1]))
$pair[1] = explode("+", $pair[1]);
$output[$pair[0]] = $pair[1];
}
if (!isset($output['op']))
return $output;
else
return false;
}
print_r(validate("(action=[123,11,23],arg=2,test=15)"));
Old stuff that wasn't adequate:
How about:
([^\(,]+)=(\[.*\]|['"]?(\w*)['"]?)
Working example/sandbox: http://regex101.com/r/bZ8qE6
Or if you need to capture only the array within the []:
([^\(,]+)=(\[(.*)\]|['"]?(\w*)['"]?)

Answer 2

I know it's answered but you could do this which I think is what you wanted:
$str = '(action=bla,arg=2,test=15,op)';
preg_match_all('/([^=,()]+)(?:=([^,)]+))?/', $str, $m);
$data = array_combine($m[1], $m[2]);
echo '<pre>' . print_r($data, true) . '</pre>';
OUTPUTS
Array
(
[action] => bla
[arg] => 2
[test] => 15
[op] =>
)

Answer 3

You can use this code:
<pre><?php
$subject = '(action=bla,arg=2,test=15,op, arg2=[1,2,3],arg3 = "to\\"t,o\\\\", '
. 'arg4 = \'titi\',arg5=) blah=312';
$pattern = <<<'LOD'
~
(?: \(\s* | \G(?<!^) ) # a parenthesis or contiguous to a precedent match
(?<param> \w+ )
(?: \s* = \s*
(?| (?<value> \[ [^]]* ] ) # array
| "(?<value> (?> [^"\\]++ | \\{2} | \\. )* )" # double quotes
| '(?<value> (?> [^'\\]++ | \\{2} | \\. )* )' # single quotes
| (?<value> [^\s,)]++ ) # other value
)? # the value can be empty
)? # the parameter can have no value
\s*
(?:
, \s* # a comma
| # OR
(?= (?<control> \) ) ) # followed by the closing parenthesis
)
~xs
LOD;
preg_match_all($pattern, $subject, $matches, PREG_SET_ORDER);
foreach($matches as $match) {
printf("<br>%s\t%s", $match['param'], $match['value']);
if (isset($match['control'])) echo '<br><br>#closing parenthesis#';
}
?></pre>