하위 표현식/메타 문자 "\s"는 공백 문자와 일치합니다.
예시 1
import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main( String args[] ) { String regex = "\\s"; String input = "Hello how are you welcome to Tutorialspoint !"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count++; } System.out.println("Number of matches: "+count); } }
출력
Number of matches: 7
예시 2
다음 예는 문자열을 읽고 그 사이의 모든 추가 공백을 제거합니다.
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String args[]) { //Reading String from user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); //Regular expression to match spaces (one or more) String regex = "\\s+"; //Compiling the regular expression Pattern pattern = Pattern.compile(regex); //Retrieving the matcher object Matcher matcher = pattern.matcher(input); //Replacing all space characters with single space String result = matcher.replaceAll(" "); System.out.print("Text after removing unwanted spaces: \n"+result); } }
출력
Enter a String hello this is a sample text with irregular spaces Text after removing unwanted spaces: hello this is a sample text with irregular spaces