I'm just getting started with Regex and want to select text that has ONLY one tab in front between two specific strings.

In that case I want to select text that is between ABC and CDE (don't select ABC and CDE) and has ONLY one tab in front of it. So I want to select Rotterdam, Amsterdam, China and Japan and do not select e.g. Hello and I have two tabs in front of me because they have two tabs.

EFGADADA
        Hello
EFGHI
        Oslo
        Australia
EFGHI
ABC
    Rotterdam
    Amsterdam
    China
    Japan
        Hello
        I have two tabs in front of me
CDE
        Oslo
        Australia

I already have this which deselects everything that has two tabs in front of it:

(?<!\t\t(.?) )[ a-zA-ZäöüÄÖÜßé@.()&-/"“] 

I know, this selects also ABC, CDE and EFGHI, which of course, don't have any tabs in front of them but thats fine because between ABC and CDE is only Text that has tabs in front of it.

Btw. I use the Regex inside Power Automate Desktop, if that matters.

CodePudding user response：

Assuming this tool supports .NET regex, you could use a variable length lookbehind.

(?<=(?:\r?\n|^)ABC(?:.*\r?\n\t)*)\S.*

See this demo at regex101 (update: refactored for working without multiline mode)
There is no check included for CDE afterwards which was not in your current pattern.