Given a string, extract the first letter of each word in it. “Words” are defined as contiguous strings of alphabetic characters i.e. any upper or lower case characters a-z or A-Z.
Examples:
Input : Geeks for geeks
Output :Gfg
Input : United Kingdom
Output : UK
Below is the Regular expression to extract the first letter of each word. It uses ‘/b'(one of boundary matchers). Please refer How to write Regular Expressions? to learn it.
\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
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