php - Use preg_replace() to Isolate Number in Source Code -

i trying pick out single value (in instance, value 544007664) source code of page pulling of youtube. right now, script have loading source code youtube page , removing "<" , ">" symbols when echo source code, displays text , doesn't display page itself. 2 preg_replace() functions (here on lines 4 , 5) pull out before , after desired value not doing expect them do.

the thing can think of preg_replace() refusing read single string text in reality several dozens of individual lines.

<?php $str = file_get_contents('https://www.youtube.com/watch?v=5xr7naz_zza'); $str = $str; $str = preg_replace('~^(.)+(meta name="twitter:app:id:ipad" content=")~', '', $str); $str = preg_replace('~(" meta name="twitter:app:url:iphone")+(.)$~', '', $str); $str = preg_replace('~<~', '', $str); $str = preg_replace('~>~', '', $str); echo $str; ?> 

any appreciated.

i think you're on right track one, overthinking bit.

here's simple snippet can use numbers:

$str = file_get_contents('https://www.youtube.com/watch?v=5xr7naz_zza');  $app_store_id = preg_replace('~.*?<meta property="al:ios:app_store_id" content="(\d+)">.*~si', '$1', $str);   print $app_store_id; 

this outputs:

544007664 

here explanation of regex:

• .*? - match character ., number of times *, until hits next portion of regex string ?. next part specific <meta ... tag looking for.
• <meta property="al:ios:app_store_id" content=" - locates meta tag "app_store_id" in it.
• (\d+) - grabbing @ least 1 + digit \d. put in parenthesis because assigned $1. use value of $1 replace contents of string. (so replacing entire web page number found.)
• "> - finishing off meta tag.
• .* - match character ., number of times * after meta tag.

---

note using s flag after expression make newlines count character. let search across multiple lines. often, s flag paired m flag, although in case wasn't necessary.

here link page listing different flags can use in php.

http://php.net/manual/en/reference.pcre.pattern.modifiers.php