正则表达式匹配新行包含一行一行只包含特定字符

Question

I have a text for a book pages that may have footnotes at the end of the string like the following example:

والخاتِم بكسر التاء اسم فاعل، فكأنه قد جاء آخر الرسل، والخاتَم بفتح التاء اسم آلة، كأنه قد ختمت به الرسالة.
__________

(1) - سورة الأحزاب آية : 43.
(2) - سورة البقرة آية : 157.
(3) - سورة الأنعام آية : 17.
(4) - سورة الكهف آية : 19.

The line that I mean in the sample and the specific characters in this case are Kashidas _ (It is not dash -), in Latin, it called underscore. What I need to get is matching the four lines or any number of lines under that line.

What I have tried let only to match the first line under that line:/_.* *(.*)/gum and this is a demo. The only way to get them all, is to repeat the pattern portion *(.*) n times equals to the number of lines in the footnotes i.e four times, regarding the example case, and this is not a practical solution like this demo

Answer 1

You can utilize the \G anchor here:

preg_match_all('~(?:\G(?!^)|_)\R+\K[^
]+~', $str, $matches);
print_r($matches[0]);

eval.in