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  1. or download this
    my $pat = qr/a+b/;
my $res = "aaab" =~ $pat;
  2. or download this
    import java.util.regex.*;
Pattern pat = Pattern.compile("a+b");
Matcher mat = pat.matcher("aaab");
boolean res = mat.matches();
  3. or download this
    boolean res = pat.matcher("aaab").matches();