import java.util.*; class Ideone { { } }
Standard input is empty
Standard output is empty
Exception in thread "main" java.util.regex.PatternSyntaxException: Dangling meta character '*' near index 0 *[0-9]x[0-9]* ^ at java.base/java.util.regex.Pattern.error(Pattern.java:2015) at java.base/java.util.regex.Pattern.sequence(Pattern.java:2190) at java.base/java.util.regex.Pattern.expr(Pattern.java:2056) at java.base/java.util.regex.Pattern.compile(Pattern.java:1778) at java.base/java.util.regex.Pattern.<init>(Pattern.java:1427) at java.base/java.util.regex.Pattern.compile(Pattern.java:1068) at java.base/java.util.regex.Pattern.matches(Pattern.java:1173) at java.base/java.lang.String.matches(String.java:2033) at Ideone.main(Main.java:7)