How to check if text exist in a text file?

[cheate]

So I have a link and I want to test if that link exist in a text file. How to do this?

 

[rostonix]

Create a list, sync this list with txt file on hard drive.

Operation with list - Merge lines - put to variable1
Word processing - Regex:
What to parse: {-Variable.variable1-} and instead of regex put link that you wanna found
Put result of this step to variable2.

Then use If

'{-Variable.variable2-}'!=''
If true = link is in the list
False = it's not there