Regex, select closest match

Question

Assume the following word sequence

BLA text text text  text text text BLA text text text text LOOK text text text BLA text text BLA

What I

Answer 1

(?s)BLA(?:(?!BLA).)*?LOOK

Try this. See demo.

Alternatively, use

BLA(?:(?!BLA|LOOK)[\s\S])*LOOK

To be safer.