Question

Suppose I have the following test string:

Start_Get_Get_Get_Stop_Start_Get_Get_Stop_Start_Get_Stop

where _ means any characters, eg: StartaGetbbGetcccGetddddStopeeeeeStart….

What I want to extract is any last occurrence of the Get word within Start and Stop delimiters. The result here would be the three bolded Get below.

Start__Get__Get__Get__Stop__Start__Get__Get__Stop__Start__Get__Stop

I precise that I’d like to do this only using regex and as far as possible in a single pass.

Any suggestions are welcome

Thanks’

Answer 1

Get(?=(?:(?!Get|Start|Stop).)*Stop)

I’m assuming your Start and Stop delimiters will always be properly balanced and they can’t be nested.