PHP正则表达式返回空白数组

Question

Problem : I need as output this from below code

$string = '<a data-mce-href="{{file:u69ruczh}}" href="{{file:u69ruczh}}">pptexamples.ppt</a>';

Generated output :

Array ( [0] => Array ( ) )

I have tried below code :

$string = '<a data-mce-href="{{file:u69ruczh}}" href="{{file:u69ruczh}}">pptexamples.ppt</a>';
$url = preg_match_all('/href=[\{\{file:(.*?)\}\}]/', $string, $match);
print_r($match);

Please assist me where did it goes wrong

Answer 1

If this format is standard this solution should also get you the desired output:

$string = '<a data-mce-href="{{file:u69ruczh}}" href="{{file:u69ruczh}}">pptexamples.ppt</a>';
$arr = explode(":",$string);
$substr = $arr[1];
$subarr = explode("}",$substr);
$finalstr = $subarr[0];
echo $finalstr;
// Output: u69ruczh

Answer 2

只需使用以下正则表达式即可完成。

$url = preg_match_all('/file\\:([a-zA-Z0-9]+)/', $string, $match);