Monday 30 September 2013

REGEX in Salesforce

What is a RegEx?

Regular Expression in computing terms is a pattern that is used to search. It has its own syntax and semantics. To learn more on what RegEx is visit --> here
Great now we learnt what REGEX is, to build your own regex visit -->

So how does all this play in salesforce apex ? There are numerous use cases for using regex and checking patterns e.g. Checking if string is in Email Format.

There are 2 Major Classes to check if regex matches. Pattern Class and Matcher Class
in short, the pattern class is used to store a type of regex and once you have a pattern stored, We use the Matcher Class to identify if a specified string matches the pattern.

Here's the code for Matching String to Email pattern In salesforce

public static Boolean checkEmailFormat(String email) {
        String emailRegEx = '[a-zA-Z0-9\\.\\!\\#\\$\\%\\&\\*\\/\\=\\?\\^\\_\\+\\-\\`\\{\\|\\}\\~\'._%+-]+@[a-zA-Z0-9\\-.-]+\\.[a-zA-Z]+';
        Pattern MyPattern = Pattern.compile(emailRegex);
        Matcher MyMatcher = MyPattern.matcher(email);
        Boolean result = MyMatcher.matches();
        return result;

This is a self explanatory code, the Pattern is first compiled and stored, then we check the "email" parameter matches the regex, the result (true/false) is returned to the calling method. Wanna learn more ? --> Check SFDC Documentation

Hope this helped  ! Let me know your thoughts or if there are some neat regex that you'd like to share in the comments . Happy Coding !