Regex to extract only text after string and before space

Question

I want to match text after given string. In this case, the text for lines starting with "BookTitle" but before first space:

BookTitle:HarryPotter JK Rowling BookTitle:HungerGames Suzanne Collins Author:StephenieMeyer BookTitle:Twilight 

Desired output is:

HarryPotter HungerGames 

I tried: "^BookTitle(.*)" but it's giving me matches where BookTitle: is in middle of line, and also all the stuff after white space. Anyone help?

Answer 1

you can have positive lookbehind in your pattern.

 (?<=BookTitle:).*?(?=\s) 

For more info: Lookahead and Lookbehind Zero-Width Assertions