A DESCRIPTION OF THE REQUEST :
Regular expressions might take very long to finish (as described in Bug ID: 5026912).
 
But 'interrupt()' does not stop a thread that executes the regular expression.
You have to use the deprecated(!) 'stop()' method on that thread.

A solution might be to add checks for 'Thread.isInterrupted()' in loops to stop
- backtracking of long running regular expressions
- reading characters from the input text
- etc.

[I tried to put 'Thread.isInterrupted()' in all 'while' and 'for' loops. It works fine, but might be too much.]

JUSTIFICATION :
'interrupt()' does not stop a thread that executes the regular expression
'stop()' method on that thread is deprecated .