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
// Java program to demonstrate extracting first// letter of each word using Regeximport java.util.regex.Matcher;import java.util.regex.Pattern;public class Test{ public static void main(String[] args) { String s1 = "Geeks for Geeks"; String s2 = "A Computer Science Portal for Geeks"; Pattern p = Pattern.compile("\\b[a-zA-Z]"); Matcher m1 = p.matcher(s1); Matcher m2 = p.matcher(s2); System.out.println("First letter of each word from string \"" + s1 + "\" : "); while (m1.find()) System.out.print(m1.group()); System.out.println(); System.out.println("First letter of each word from string \"" + s2 + "\" : "); while (m2.find()) System.out.print(m2.group()); }} |
Python3
# Python program to demonstrate extracting first# letter of each word using Regeximport res1="Geeks for Geeks"s2="A Computer Science Portal for Geeks"p = re.compile("\\b[a-zA-Z]")print("First letter of each word from string '{0}' : ".format(s1))for m1 in re.finditer(p,s1): print(m1.group(0),end="") print()print("First letter of each word from string '{0}' : ".format(s2))for m2 in re.finditer(p,s2): print(m2.group(0),end="") # This code is contributed by Pushpesh Raj. |
C#
// C# program to demonstrate extracting first// letter of each word using Regexusing System;using System.Text.RegularExpressions;public class GFG{ public static void Main() { string s1 = "Geeks for Geeks"; string s2 = "A Computer Science Portal for Geeks"; Regex p = new Regex("\\b[a-zA-Z]"); Console.WriteLine("First letter of each word from string \"" + s1 + "\" : "); foreach (Match ItemMatch in p.Matches(s1)) Console.Write(ItemMatch.Value); Console.WriteLine(); Console.WriteLine("First letter of each word from string \"" + s2 + "\" : "); foreach (Match ItemMatch in p.Matches(s2)) Console.Write(ItemMatch.Value); }}// This code is contributed by Utkarsh |
Output:
First letter of each word from string "Geeks for Geeks" : GfG First letter of each word from string "A Computer Science Portal for Geeks" : ACSPfG
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