Preg_replace不替换所有匹配项

Question

I am trying to replace every link in a file with regular expression but when i try it, it replaces only the first match and continue forward without replacing the others. This is my code:

$allData = preg_replace( '|(.+?src=")(.+?)(".*)|is', "\\1" . $urlRoot . "/\\2\\3", $allData );

it has to take the 2nd match from the 3 and place it after the $urlRoot and do this for every match in the file. It is working but only for the first one.

Answer 1

Just remove the .* from 3rd group:

$allData = preg_replace( '|(.+?src=")(.+?)(")|is', "\\1" . $urlRoot . "/\\2\\3", $allData );

You could aloso do:

$allData = preg_replace( '|\bsrc="([^"]+)|is', 'src="' . $urlRoot . "/$1", $allData );