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Regular Expressions --- Make expressions using patterns that can match text!

java.util.regex.Pattern --- https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html

java.util.regex.Matcher --- https://docs.oracle.com/javase/8/docs/api/java/util/regex/Matcher.html

01. regex_countNumberOfVowels H  
02. regex_numberOfMatches H  
03. regex_replaceAllNumbers H  
04. regex_secondMatch H  
05. regex_phoneNumber H  
06. regex_verifyZipCode H  
07. regex_verifyEmailAddress H  
08. regex_verifyLastFirst H  
09. regex_verifyNumber0to100 H  
10. regex_verify_classC_IPaddress H  

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