What's the difference between String.matches and Matcher.matches?

Question

What\'s the difference between String.matches and Matcher.matches? Is there any difference in terms of performance or other things?

Answer 1

Pattern.compile compiles the pattern so that when you execute metcher.matches, pattern is not re compiled again and again. Pattern.compile pre compiles it. However, if you use string.matches, it compiles the pattern everytime you execute this line. So, it is better to use Pattern.compile.