Extracting all Email Ids in any given String using Regular Expressions

Last Updated : 16 Dec, 2024

Given a string str, the task is to extract all the Email ID's from the given string.

Example:

Input: "Please send your resumes to Hr@[email protected] for any business inquiry please mail us at business@[email protected]"
Output: Hr@[email protected]
business@[email protected]

Approach: The problem can be solved based on the following idea:

Create a regex pattern to validate the number as written below:
regex = “^[0-9]{3}[A-Z]{2}[0-9]{8}$“
Where,
$: Matches the end of the line
\s: Matches whitespace
\S: Matches any non-whitespace character
*: Repeats a character zero or more times
\S: Matches any non-whitespace character
*?: Repeats a character zero or more times (non-greedy)
+: Repeats a character one or more times
+?: Repeats a character one or more times (non-greedy)
[aeiou]: Matches a single character in the listed set
[^ABC]: Matches a single character, not in the listed set
[a-z0-9]: The set of characters can include a range
(: Indicates where string extraction is to start
): Indicates where string extraction is to end

Follow the below steps to implement the idea:

Create a regex expression to extract all the Email Ids from the string.
Use Pattern class to compile the regex formed.
Use the matcher function to find.

Below is the code implementation of the above-discussed approach:

C++

// C++ code for the above approach #include <iostream> #include <regex> #include <string>  using namespace std;  void findEmails(string str) {     // You can Add n number of Email     // formats in the below given     // String Array.     string strPattern[]         = { "\\S+@\\S+" };     for (int i = 0; i < 1; i++) {         regex pattern(strPattern[i]);         smatch matches;         while (regex_search(str, matches, pattern)) {             cout << matches[0] << endl;             str = matches.suffix().str();         }     } }  int main() {     string str = "Please send your resumes on "                  "Hr@[email protected] "                  "for any business enquiry please mail us "                  "on [email protected] "                  "and writing.geeksforgeeks.org";     findEmails(str);     return 0; }  // This code is contributed by shivamsharma215

Java

// Java code for the above approach import java.io.*; import java.util.regex.Matcher; import java.util.regex.Pattern;  public class GFG {      // Driver Code     public static void main(String[] args)     {          // String containing in it         String str             = "Please send your resumes on Hr@[email protected]"               + "  for any business enquiry please mail us on [email protected]"               + " and writing.geeksforgeeks.org";          findEmails(str);     }      // Function to extract all email     // id's from a given string     static void findEmails(String str)     {          // You can Add n number of Email         // formats in the below given         // String Array.         String strPattern[] = { "\\S+@\\S+" };         for (int i = 0; i < strPattern.length; i++) {             Pattern pattern                 = Pattern.compile(strPattern[i]);             Matcher matcher = pattern.matcher(str);             while (matcher.find()) {                 System.out.println(matcher.group());             }         }     } }

Python

import re  def find_emails(text):     # List of email patterns to look for     patterns = [r"\S+@\S+"]          for pattern in patterns:         # Compile the pattern         email_regex = re.compile(pattern)                  # Find all instances of the pattern in the text         emails = email_regex.findall(text)                  # Print each email found         for email in emails:             print(email)  # Example usage text = "Please send your resumes on Hr@[email protected]" \        "  for any business enquiry please mail us on [email protected]" \        " and writing.geeksforgeeks.org" find_emails(text)

// C# code for the above approach using System; using System.Text.RegularExpressions;  class GFG  {      // Driver Code   static void Main(string[] args)   {      // String containing in it     string str       = "Please send your resumes on Hr@[email protected]"       + "  for any business enquiry please mail us on [email protected]"       + " and writing.geeksforgeeks.org";      findEmails(str);   }    // Function to extract all email   // id's from a given string   static void findEmails(string str)   {      // You can Add n number of Email     // formats in the below given     // String Array.     string[] strPattern = { @"\S+@\S+" };     for (int i = 0; i < strPattern.Length; i++) {       MatchCollection matches         = Regex.Matches(str, strPattern[i]);       foreach(Match match in matches)       {         Console.WriteLine(match.Value);       }     }   } }  // This code is contributed by ik_9

JavaScript

// JS code to implement above approach  function findEmails(str) {     // You can Add n number of Email     // formats in the below given     // String Array.     const strPattern = ["\\S+@\\S+"];     for (let i = 0; i < 1; i++) {         const pattern = new RegExp(strPattern[i], 'g');         let matches;         while ((matches = pattern.exec(str)) !== null) {             console.log(matches[0]);         }     } }  const str = "Please send your resumes on " +             "Hr@[email protected] " +             "for any business enquiry please mail us " +             "on [email protected] " +             " and writing.geeksforgeeks.org"; findEmails(str);  //this code is contributed by Tushar_Rokade

Output

Hr@[email protected] [email protected]

Time Complexity: O(n)

Space Complexity: O(n)

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Extracting all Email Ids in any given String using Regular Expressions

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