Text blocks in Thunkable aren’t compatible with regex. So this just checks to see if the text input’s value contains that long string of characters in exactly that order:
It would be like if you had a block for does “hello” contain “abcde” it would be false whereas “hello_abcde” or “adcde_goodbye” would be true.
That feature request was submitted several years ago: Request for text block "Compare text with regular expressions" · Issue #987 · thunkable/thunkable-issues · GitHub.
One possible way to do what you want is discussed here: Fun Share: Wordle Solver in Thunkable!