PHP正则表达式以确切的给定模式进行搜索

Question

i want to give regex a pattern and force it to read it all ..

http://example.com/w/2/1/x/some-12345_x.png

i want to target "some-12345_x"
i used this /\\/(.*).png/ , it doesnt work for some reason

how do i force it to remember it must start with / and end with .png?

Answer 1

You can do:

^.*/(.*)\.png$

which captures what occurres after the last / till .png at the end.

Answer 2

If you always want to get the final file-name, minus the extension, you could use PHP's substr() instead of trying to come up with a regex:

$lastSlash = strrpos($url, '/') + 1;
$name = substr($url, $lastSlash, strrpos($url, '.') - $lastSlash);

Also, a more readable method would be to use PHP's basename() :

$filename = basename($url);
$name = substr($filename, 0, strpos($filename, '.'));

To actually use a regex, you could use the following pattern:

.*/([^.]+).png$

To use this with PHP's preg_match() :

preg_match('|.*/([^.]+).png$|', $url, $matches);
$name = $matches[1];

Answer 3

You might need to use reg-ex in this situation for a particular reason, but here's an alternative where you don't:

$url = "http://example.com/w/2/1/x/some-12345_x.png";
$value = pathinfo($url);
echo $value['filename'];

output:

some-12345_x

pathinfo() from the manual

Answer 4

How about:

~([^/]+)\.png$~

this will match anything but / until .png at the end of the string.