I am still having problems understanding difference in matches() and find(), here the code
final Matcher subMatcher = Pattern.compile("\\d+").matcher("123");
System.out.println("Found : " + subMatcher.matches());
System.out.println("Found : " + subMatcher.find());
Output is
Found : true Found : false
Of what I understand about matches and find from this answer , is that matches() tries to match the whole string while find() only tries to match the next matching substring, and the matcher adds a ^ and $ meta-character to start and beginning and the find() can have different results if we use it multiple no of times, but here still 123 remains a substring, and the second output should be true. If i comment out the second line then it does shows output as true
When you call matches()
, the Matcher
already searches for a match (the whole String
). Calling find
the Matcher
will try to find the pattern again after the current match, but since there are no characters left after a match that matches the entire String
, find
returns false
.
To search the String
again, you'd need to create a new Matcher
or call reset()
:
final Matcher subMatcher = Pattern.compile("\\d+").matcher("123");
System.out.println("Found : " + subMatcher.matches());
subMatcher.reset();
System.out.println("Found : " + subMatcher.find());
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