JavaScript Program to Extract Email Addresses from a String
Last Updated : 10 Jul, 2024
In this article, we will explore how to extract email addresses from a string in JavaScript. Extracting email addresses from a given text can be useful for processing and organizing contact information.
There are various approaches to extract email addresses from a string in JavaScript:
Using Regular Expressions
Regular expressions provide an elegant way to match and extract email addresses from text.
Example: In this example, we will extract the substring that matches the given regular expression.
JavaScript function extract(str) { const email = /\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b/g; return str.match(email); } const str = "My email address is [email protected]"; console.log(extract(str)); Splitting and Filtering
In this approach we will Split the string by space using str.split() method and then use filter() method filter out valid email formats.
Example: In this example, we will use split the string and filter out the required email substring.
JavaScript function extract(str) { const words = str.split(' '); const valid = words.filter(word => { return /\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b/.test(str); }); return valid; } const str = "My email address is [email protected]"; console.log(extract(str)); Using String Matching and Validation
In this approach, we will check each substring for email validity.
Example: In this example we will check the email validation for every substring and display the ouput.
JavaScript function isValid(str) { return /\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b/.test(str); } function extract(str) { const words = str.split(' '); const email = []; for (const word of words) { if (isValid(word)) { email.push(word); } } return email; } const str = "My email address is [email protected]"; console.log(extract(str)); Using a Custom Parser
The custom parser approach iterates through words in the text, identifying email addresses by checking for the presence of '@' and '.' characters, and ensuring the structure resembles an email. This method is simple and doesn't rely on regex.
Example: The function extractEmails parses a text to find and return email addresses present within it. It searches for patterns containing '@' and '.', and returns them as an array.
JavaScript function extractEmails(text) { const emails = []; const words = text.split(/\s+/); for (let word of words) { if (word.includes('@') && word.includes('.')) { const parts = word.split('@'); if (parts.length === 2 && parts[1].includes('.')) { emails.push(word); } } } return emails; } console.log(extractEmails("Contact us at [email protected] and [email protected]")); Using the match Method with Regular Expressions
In this approach, we use JavaScript's match method combined with a regular expression specifically designed to capture email addresses. This method is efficient and straightforward for extracting all occurrences of email addresses from a given string.
Steps:
- Define the Regular Expression: Create a regular expression pattern that matches typical email addresses.
- Use the match Method: Apply the match method on the input string with the defined regular expression to extract all email addresses.
- Handle the Results: The result will be an array of email addresses or null if no matches are found.
Example: This example demonstrates how to extract email addresses from a string using the match method and regular expressions.
JavaScript function extractEmailsUsingMatch(input) { // Define a regular expression for matching email addresses const emailRegex = /[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/g; // Use the match method to find all email addresses in the input string const matches = input.match(emailRegex); // Return the array of matched email addresses or an empty array if no matches are found return matches || []; } // Example usage: let inputString = "Contact us at [email protected], [email protected], or [email protected] for more information."; let emailAddresses = extractEmailsUsingMatch(inputString); console.log(emailAddresses); // Output: ["[email protected]", "[email protected]", "[email protected]"]
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