使用正则表达式在包含某些内容的行之前插入文本（Notepad ++）？

Question

I have several lines like this:

Apples
__________
B
C

Bananas
___________
D
E

Carrots
____________
F 
G

I would like to make it so that Apples, bananas, and carrots are each their own separate heading in html. So I would like to do a regex search for 3 consecutive underscores or more and then insert html heading tags in the line preceding it. Can someone tell me how to do this with Notepad++ regex search and replace?

Answer 1

Search for

(^|\n)(.*)([\n\r]+)(_{3,})([\n\r]|$)

and replace it with

$1<h1>$2</h1>$5

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