Question

I am trying to delete a line from textarea post result, starting with “To”
My try:

$var = 'Date: __date\n"."Mime-Version: 1.0\nFrom: __From \nTo: __To\nSubject: __Subject         \nReply-To: __Reply-To\nX-Job: __X-Job';

$text = preg_replace("/To(.*)$\n/s","",$var);

but it did not work.

i want this output

Date: __date\n"."Mime-Version: 1.0\nFrom: __From \nSubject: __Subject         \nReply-To: __Reply-To\nX-Job: __X-Job'

Edit:
The last solution i used, which take into consideration that the input is from textarea

        $text = preg_replace("/To.*?Subject:/s","Subject:",$var);

Answer 1

You need the /m modifier so that the ^ matches the start of each line, and then use this expression:

$text = preg_replace("/^To:.*/m", "", $var);

I’m not using the /s modifier, because that would cause . to match newlines as well, and that’s not what you want here.

Demo

Btw, according to the specification, MIME headers may span multiple lines; I’m ignoring that in this answer 🙂