How to force fail a java regex?

Question

In java, you can text a regex by doing

"mystring".matches("myregex")

But is there a certain regex you can use, that will make matches function evaluate to a false? It needs to work for all cases (i.e. no matter what string you test it with).

Thanks.

Why do you want this? If you've already made the assumption that the regex must always be false, what's stopping you from simply using a boolean? — Jeroen Vannevel, Commented Jul 16, 2013 at 23:56
probably because he wants to pass it to some (library) function calling matches(). — David Foerster, Commented Jul 17, 2013 at 0:00

Jon McPherson · Accepted Answer · 2013-07-17 00:01:31Z

6

I don't know why you would need this, but this should do the trick

"mystring".matches("(?!)")

answered Jul 17, 2013 at 0:01

Jon McPherson

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