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importjava.io.*;importjava.util.*;importjava.util.regex.Pattern;importjava.util.regex.Matcher;publicclassSolution{publicstaticvoidmain(String[]args){Scannerscanner=newScanner(System.in);Patternpattern=Pattern.compile("(?<![aeiouAEIOU])(.)");Matchermatcher=pattern.matcher(scanner.nextLine());intcount=0;while(matcher.find())count++;System.out.println("Number of matches : "+count);}}
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Negative Lookbehind
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Java 15: