Shouldn't “static” patterns always be static?

Question

I just found a bug in some code I didn\'t write and I\'m a bit surprised:

Pattern pattern = Pattern.compile(\"\\\\d{1,2}.\\\\d{1,2}.\\\\d{4}\");
Matcher matc         


        

Answer 1

Yes, compiling the Pattern on each use is wasteful, and defining it statically would result in better performance. See this SO thread for a similar discussion.