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How to extract a group from a Java String that contains a Regex pattern
How to extract a group from a Java String that contains a Regex pattern
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexTest { public static void main(String[] args) { Pattern pattern = Pattern.compile("fun"); Matcher matcher = pattern.matcher("Java is fun"); // using Matcher find(), group(), start() and end() methods while (matcher.find()) { System.out.println("Found the text \"" + matcher.group() + "\" starting at " + matcher.start() + " index and ending at index " + matcher.end()); } } }
check if a string contains numbers or not using Java regex.
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Numberornot { public static void main(String[] args) { String s; System.out.println("enter string"); Scanner sc=new Scanner(System.in); s = sc.nextLine(); System.out.println(isNumber(s)); } public static boolean isNumber( String s ) { Pattern p = Pattern.compile( "[0-9]" ); Matcher m = p.matcher( s ); return m.find(); } }
Output
enter string hello123 true
Output
enter string hello false
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