Online Java Compiler By
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import java.util.regex.*; class RegexExample7{ public static void main(String args[]){ System.out.println("by character classes and quantifiers ..."); System.out.println(Pattern.matches("[789]{1}[0-9]{9}", "9953038949"));//true System.out.println(Pattern.matches("[789][0-9]{9}", "9953038949"));//true System.out.println(Pattern.matches("[789][0-9]{9}", "99530389490"));//false (11 characters) System.out.println(Pattern.matches("[789][0-9]{9}", "6953038949"));//false (starts from 6) System.out.println(Pattern.matches("[789][0-9]{9}", "8853038949"));//true System.out.println("by metacharacters ..."); System.out.println(Pattern.matches("[789]{1}\\d{9}", "8853038949"));//true System.out.println(Pattern.matches("[789]{1}\\d{9}", "3853038949"));//false (starts from 3) }}
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