How can I find a specific part of a string in a php file?

Question

PHP

Hello.
Immediately I say php - I'm no pawn.
I have a question for people who know a lot about this.
How can you open, for example, a .html file, find the following line there
<$include file="include/top.html">
and take only include/top.html from it. Well, like smart.
Thank you!

Answer 1

You can use regular expressions.