English | 简体中文 | 繁體中文 | Русский язык | Français | Español | Português | Deutsch | 日本語 | 한국어 | Italiano | بالعربية
Sub-expression/The meta-character " \b Matches the word boundary outside the brackets. Matches the space inside the parentheses (0x08)。
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexExample { public static void main(String args[]) { String regex = \\\\bbecause\\\b; Scanner sc = new Scanner(System.in); System.out.println("Enter a string:"); String input = sc.nextLine(); Pattern p = Pattern.compile(regex); Matcher m = p.matcher(input); int count = 0; while(m.find()) { count ++; } System.out.println("Number of matches:");+count); } }
Output Result
Enter a string: A sentence doesn't end with because because, because is a conjunction Number of matches: 3
The following Java example reads a string value from the user and prints the number of word boundaries.
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String args[]) { System.out.println("Enter input string:"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); String regex = "\\b"; //Compile regular expression Pattern pattern = Pattern.compile(regex); //Retrieve matcher object Matcher matcher = pattern.matcher(input); int count = 0; while(matcher.find()) { count ++; } System.out.println(count); } }
Output Result
Enter input string: Hello, how are you? Welcome to w3codebox 14