Extracting data with a certain pattern from a .txt file [closed] - php

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I have a large .txt file that contains a lot of text like this:
data-domain="googledotcom"
So, I want to extract whatever is in the quotes (in this case googledotcom) into a new file. Results should be each separated with a new line (or at least with a tab).
I've looked online and couldn't find an easy way to do it. I might have tagged this question wrong, just because I'm not sure how to accomplish this, thanks for help.

Answer 1

$text = file('file.txt') ;
foreach ($text as $value) {
if (preg_match('/"([^"]+)"/', $value, $match)) {
$domains[] = $match[1];
}
}
file_put_contents("domains.txt", implode("\n", $domains));

Answer 2

As mentioned in comments, you can use preg_match_all() regex for that:
<?php
header('Content-Type: text/plain; charset=utf-8');
$test = <<<STR
xxx
data-domain="test1"
yyy data-domain="test2"
zzz
data-domain="test3"
STR;
$results = preg_match_all('/data\-domain\=\"(.+)\"/', $test, $matches);
print_r($matches[1]);
?>
Results:
Array
(
[0] => test1
[1] => test2
[2] => test3
)
Dependent on filesize, you should read it by fopen() + fread() (row-by-row if it is large) or by file_get_contents() (entire file at once, if it is relatively small). Then analyze it with regular expression and write results to a new file.