Can java.util.regex.Pattern do partial matches?

Question

Is it possible to know if a stream/string contains an input that could match a regular expression.

For example

 String input=\"AA\";         


        

Answer 1

An alternative to hitEnd is to specify the requirement in the RE itself.

// Accepts up to 5 'A's or 5 'A's and a 'B' (and anything following)
Pattern pat = Pattern.compile("^(?:A{1,5}$|A{5}B)");
boolean yes = pat.matcher("AA").find();
boolean no = pat.matcher("BB").find();