How can I use the regex pattern with the exclude function for filtering out unwanted data from a dataset?

 In the context of Salesforce, here is the approach given:-

Let us consider a scenario where you have a text dataset that contains email addresses and you want to extract only email addresses that do not end with “.gov”. Here is how you can achieve this by using a negative lookahead assertion on the regex pattern:-

Import java.util.regex.Matcher;
Import java.util.regex.Pattern;

Public class RegexExample {
    Public static void main(String[] args) {
        String text = “Emails: john.doe@example.com, jane_smith@gmail.com, admin@example.gov”;
        // Define the regex pattern to match email addresses not ending with “.gov”
        String regexPattern = \b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.(?!gov\b)[A-Za-z]{2,}\b;
        // Compile the pattern and create a matcher object
        Pattern pattern = Pattern.compile(regexPattern);
        Matcher matcher = pattern.matcher(text);
        // Find and print matching email addresses
        While (matcher.find()) {
            System.out.println(“Match: “ + matcher.group());
        }
    }
}

Here is the example given by using the Python programming language

Import re

# Function to extract email addresses not ending with “.gov” from a given text
Def extract_emails(input_text):
    # Define the regex pattern to match email addresses not ending with “.gov”
    Regex_pattern = r’[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.(?!gov)[A-Za-z]{2,}’
    # Find all matching email addresses
    Matches = re.findall(regex_pattern, input_text)
    Return matches
# Read text from a file (e.g., emails.txt)
Def read_text_from_file(file_path):
    With open(file_path, ‘r’) as file:
        Text = file.read()
    Return text
# Example usage
If __name__ == “__main__”:
    # Read text from a file (you can replace ‘emails.txt’ with your file path)
    Input_text = read_text_from_file(‘emails.txt’)
    # Extract email addresses not ending with “.gov”
    Extracted_emails = extract_emails(input_text)
    # Print the extracted email addresses
    Print(“Email addresses not ending with ‘.gov’:”)
    For email in extracted_emails:
        Print(email)

Here is the example given by using HTML:-

<meta</span> charset=”UTF-8”>

<meta</span> name=”viewport” content=”width=device-width, initial-scale=1.0”>

[removed]

    Function extractEmails() {
        Var inputText = document.getElementById(‘inputText’).value;
        Var regexPattern = /[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.(?!gov)[A-Za-z]{2,}/g;
        Var extractedEmails = inputText.match(regexPattern);
        // Display extracted email addresses
        Var outputDiv = document.getElementById(‘outputDiv’);
        outputDiv[removed] = “Email addresses not ending with ‘.gov’:”;
        if (extractedEmails && extractedEmails.length > 0) {
            for (var I = 0; I < extractedEmails xss=removed xss=removed>

[removed]


    Email Extraction


    Enter text containing email addresses:



    Extract Email Addresses