在PHP中删除多个/ n

Question

I'm working on a old database, and i'm trying to clear the multiple /n on the text fields.

I have found this code :

   $newphrase = preg_replace("#\n+#", "\n", $newphrase);

It's works, but I want to replace /n only when there is more than 3 /n, not two.

So, my goal is to transform :

Hello n/ guys /n /n how are /n /n /n you ?

into

Hello n/ guys /n /n how are /n /n you ?

Do you have any idea ?

Answer 1

$newphrase = preg_replace("#(\n ?){3,}#", "\n\n", $newphrase);

Answer 2

如果您的意思是/n而不是\\n （换行符），请执行以下操作：

$newphrase = preg_replace("/(?:\/n\x20?){3,}/", "\/n\x20\/n\x20", $newphrase);

Answer 3

Replacing 3 or more blank lines with 1 blank line -

Find:
\\n(?:[^\\S\\n]*\\n){2,}
Replace:
\\n