PHP Regex get the value from JavaScript code

Question

I have a problem with designing a regular expression to extract a value from JavaScript code.
I need to find the line where Array('38') is and get the numeric value of the Math.floor function's argument there.

Given this code, the result would be 296:

addCombination(158, new Array('38'), -9, Math.floor(296), 0, -1, 'LB229');
addCombination(159, new Array('39'), -2, Math.floor(221), 0, -1, 'LB201');
addCombination(160, new Array('40'), -2, Math.floor(201), 0, -1, 'LB243');

Thanks for advice.

Could you explain a little more what you need to obtain? The result of Math.floor(296) if a line contains Array('38')? Or the substring Math.floor(296)? — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Apr 9, 2015 at 7:54
hi, i need to extract number 296 from the Math.floor(296) if the line contains Array('38'). Great thanks in advanced — J B
– J B, Commented Apr 9, 2015 at 7:57

Avinash Raj · Accepted Answer · 2015-04-09 11:19:15Z

1

You could achieve this through a single regex.

^(?=.*\bArray\('38'\)).*?\bMath\.floor\(\K\d+

DEMO

(?=.*\bArray$'38'$) would match at the start of a line only if the line contains the text Array('38').
And the following .*?\bMath\.floor\( matches all the chars on that line from the start until Match.floor( string.
\K discards the previous match.
\d+ matches the number present inside the Math.floor function.

Example:

$s = <<<EOT
addCombination(158, new Array('38'), -9, Math.floor(296), 0, -1, 'LB229');
addCombination(159, new Array('39'), -2, Math.floor(221), 0, -1, 'LB201');
addCombination(160, new Array('40'), -2, Math.floor(201), 0, -1, 'LB243');
EOT;
preg_match_all("~^(?=.*\bArray\('38'\)).*?\bMath\.floor\(\K\d+~m", $s, $matches);
print_r($matches[0]);

Output:

Array
(
    [0] => 296
)

edited Apr 9, 2015 at 11:19

answered Apr 9, 2015 at 8:05

Avinash Raj

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3 Comments

J B Over a year ago

strange... it won't work like php string... $regex = "/^(?=.*\bArray('38')).*?\bMath\.floor(\K\d+/";

Avinash Raj Over a year ago

enable multiline modifier.

Avinash Raj Over a year ago

Since you're new to this site, i suggest you to read this

Wiktor Stribiżew · Accepted Answer · 2015-04-09 11:46:16Z

0

Here is an example PHP code you might use to extract the Math.floors:

<?php
   $str = "addCombination(158, new Array('38'), -9, Math.floor(296), 0, -1, 'LB229');\naddCombination(159, new Array('38'), -2, Math.floor(221), 0, -1, 'LB201');\naddCombination(160, new Array('38'), -2, Math.floor(201), 0, -1, 'LB243');";
   preg_match_all("/Math\\.floor\\(\\K\\d+(?=\\))/", $str, $matches);
   foreach ($matches[0] as $line)
   {
       echo $line . "\n";
   }
?>

Output:

296                                                                                                                                                                                                                                                    
221                                                                                                                                                                                                                                                    
201

edited Apr 9, 2015 at 11:46

answered Apr 9, 2015 at 8:03

Wiktor Stribiżew

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3 Comments

J B Over a year ago

hi, this one not working, as string ir from the few lines and preg_match extrancting just value of first line...

J B Over a year ago

ok, but there we've got array, the question is to get values from separate lines, for example if array('38') then extracted value 296; if array('39') then - 221; if array('40') then - 201;

Wiktor Stribiżew Over a year ago

I updated the code. Now, it seems working as expected.

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