Examples:
Input : Geeks for geeks Output :Gfg Input : United Kingdom Output : UK
\b[a-zA-Z]
// Java program to demonstrate extracting first // letter of each word using Regex import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test { static void printFirst(String s) { Pattern p = Pattern.compile("\\b[a-zA-Z]"); Matcher m = p.matcher(s); while (m.find()) System.out.print(m.group()); System.out.println(); } public static void main(String[] args) { String s1 = "Geeks for Geeks"; String s2 = "A Computer Science Portal for Geeks"; printFirst(s1); printFirst(s2); } }
Output:
GfG ACSPfG