How to extract data from this PHP string using preg_match?
Question
What would be the best way to extract the content within the data array (5436, 342w5...) from the following php string:
series: [{
type: 'area',
name: 'product_data',
data: [ 5436, 342w5, 564s5, 6778, 8954, 567e5, 6578, 67584 ]
}]
Something along the following?
preg_match("/(.*), (.*)/", $input_line, $output_array);
Thanks in advance :)
Edit: complete code below
PHP:
$file = "file.html";
$file = file_get_contents($file);
$input_line = strip_tags($file);
$data = preg_match("/(.*), (.*)/", $input_line, $output_array);
print_r($output_array);
file.html:
<!DOCTYPE>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Index</title>
<script type="text/javascript">
var chart;
jQuery(document).ready(function() {
chart = new Highcharts.Chart({
series: [{
type: 'area',
name: 'product_data',
data: [ 5436, 342w5, 564s5, 6778, 8954, 567e5, 6578, 67584 ]
}]
});
});
</script>
<body>
</body>
</head>
3 answers
solution1
0 2015-02-17 16:19:24
You can do it with this pattern, it isn't the more simple way but it is done in one shot and is efficient:
$pattern = "~
(?:
\G(?!\A), # anchored to the previous match
|
\A # anchored at the start of the string
[^s]*(?:s(?!eries:)[^s]*)* # all until 'series:'
series:
[^'d]*(?:'[^']*'[^'d]*|\Bd|d(?!ata:))* # all until 'data:'
data:
\s*\[
)
\s*\K # remove all on the left from the result
[^], ]+ # match the item
~x";
if (preg_match_all($pattern, $str, $m))
print_r($m[0]);
You can use a more conventional way that consists to extract the array first and after to explode it into items:
$pattern = '~\bdata: \[\K[^]]+~';
if (preg_match($pattern, $str, $m)) {
$items = explode(', ', trim($m[0]));
print_r($items);
}
solution2
0 2015-02-17 16:29:26
Or just something like this :
preg_match('#data:\s\[(.*)\]#', $input_line, $output_array);
$data = explode(',', $output_array[1]);
print_r($data);
solution3
0 2015-02-17 16:36:28
Not exactly the answer you're looking for but here goes...
The data is JSON encoded but for PHP to understand it, it needs a bit of adjustment:
$:~/testscripts> cat js.php
<?php
// Raw data
$input_line=<<<STRING1
series: [{
type: 'area',
name: 'product_data',
data: [ 5436, 342w5, 564s5, 6778, 8954, 567e5, 6578, 67584 ]
}]
STRING1;
$data=json_decode($input_line,true);
echo "Decoded: ".print_r($data,true).PHP_EOL;
echo "---------------------".PHP_EOL;
// Adjust format
$d2=<<<STRING2
{"series": [{
"type":"area",
"name": "product_data",
"data": [ "5436", "342w5", "564s5", "6778", "8954", "567e5", "6578", "67584" ]
}]
}
STRING2;
$dd2=json_decode($d2,true);
echo "Decoded D2: ".print_r($dd2,true).PHP_EOL;
echo "---------------------".PHP_EOL;
// Reverse
$a=array(
'series'=>array(
array(
'type'=>'area',
'name'=>'product_data',
'data'=>array('5436','342w5','564s5', '6778', '8954', '567e5', '6578', '67584')
)
)
);
echo "Encoded: ".json_encode($a).PHP_EOL;
$series=$a['series'];
$dummy=reset($series); // return the first element of array
$data=$dummy['data'];
echo "Data: ".print_r($data,true).PHP_EOL;
And, when you run the above, you get:
$~/testScripts> php -f js.php
Decoded:
---------------------
Decoded D2: Array
(
[series] => Array
(
[0] => Array
(
[type] => area
[name] => product_data
[data] => Array
(
[0] => 5436
[1] => 342w5
[2] => 564s5
[3] => 6778
[4] => 8954
[5] => 567e5
[6] => 6578
[7] => 67584
)
)
)
)
---------------------
Encoded: {"series":[{"type":"area","name":"product_data","data":["5436","342w5","564s5","6778","8954","567e5","6578","67584"]}]}
Data: Array
(
[0] => 5436
[1] => 342w5
[2] => 564s5
[3] => 6778
[4] => 8954
[5] => 567e5
[6] => 6578
[7] => 67584
)
As can be seen, even though the $input_line and the result of performing json_encode are similar, only the adjusted raw data is working properly.
You'll need to adjust the $input_line by enclosing everything in speech marks ( " and not ' ), and adding curly braces at the start and end (possible using a simpler set of regular expressions) then pass that through a json_decode function (the true returns an array). After that, it should be a simple case of accessing an array element
Sorry for the wall of code which isn't what you want. Just thought I would add another option which may be easier. Or maybe not
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