Related issues with character matching

Problem with character matching
Can you tell me how to match the following characters in a bunch of source code
IMG id= "main-image" src= "Http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg"

I mainly want to get to the address of the picture, where 41auzc7rbpl._sy300_ (the file name of the image is randomly generated, each time is different),
How can I get to http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg

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------Solution--------------------
It is most convenient to use regular processing:

$str = ' How do I match the following characters in a bunch of source code
IMG id= "main-image" src= "http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg";

$p = ' #img \s*id= "Main-image" \s*src= "(http://ecx\.images-mazon\.com/images/i/.+\. ( Jpg
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Gif
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Jpeg
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PNG)) "#U";
Preg_match ($p, $str, $result) && var_dump ($result);

Depending on the situation, you can also parse to the DOM:

$html = ";
$doc = new DOMDocument ();
$doc->loadhtml ($html);
echo $doc->getelementbyid (' Main-image ')->getattribute (' src ');

After 100,000 cycles of testing, the latter is 7 times times faster than the former, and the gap may be greater as the size of the test source string increases.
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$STR = ' img id= ' main-image "src=" http://ecx.images-mazon.com/images/I/41Auzc7RBPL._SY300_.jpg ";

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IMG id= "Main-image" src= "(. *)"
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IUs;
Preg_match ($p, $str, $result);
Print_r ($result);
If you only need to get to the URL of that picture name then you need to split
$ep =explode ('/', $result [0]);
Echo $ep [5];

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