what does it mean

Question

found |= text.contains(wort.toLowerCase().trim());

what does |= mean?

Answer 1

That is a bitwise OR operator.
The variable 'found' should be a boolean and the expression on the right hand side would also evaluate to a boolean.

0 | 0 = 0
0 | 1 = 1
1 | 0 = 1
1 | 1 = 1