Find and replace only for headers

[CrispyBacon]

Like the title says is there a way to find and replace words only in the headers.

Edit: For example I want to find and replace words in <h1> only

Or to change a Chapter name all at once.

I want to change all the - to :
I know I can use this <p>\s*Chapter (\d+) : (.*?)\s* </p> to change it
Is there an expression I can use in the replace box for increasing intervals?

Ex.
Chapter 1- Name
Chapter 2- Name
Chapter 3- Name

to

Chapter 1: Name
Chapter 2: Name
Chapter 3: Name

[KevinH]

Use regular expressions is the short answer. The Sigil users guide has more info. Also if yu can show us an actual example (with html code), people here may help you create it.