如何在php中使用preg_match_all函数从peragraph中获取新行？

Question

I have a peragraph with some new lines :

 First line

Second line

Third line

 And this is the last line

I want to get the second line from the above peragraph.

So the result I want should be :

 "Second line"

I have tried the following script with preg_match_all() function but I don't know why it's not working.

 <?php
 $pera="First line

 Second line

 Third line

  And this is the last line";


 preg_match_all("#
+{2}.*+#",$pera,$results);
print_r($results);

Do you have any idea how to get the second line from the paragraph?

Any help is much appriciated.

Thanks!

Answer 1

Only for the purpose demonstrated, explode is really better for performance, but if you do want/have to use regex, don't use preg_match_all. That makes it global but you don't need that so go with preg_match. Then, change the pattern:

{2}.*

This will match the second line including leading newline character.

https://regex101.com/r/jA3dL9/1

If you want to match w/o the newline, use a capturing group:

{2}(.*)