Question

I have a requirement where in a request containing field comes in to my rest webservice.

In my webservice, I have to check for this field and if the validation for this passes, then I send the request to a third party service.

Validation Required:

message_from field contains an email address as string. I have to check if the domain name(everything after @) is roin.com

For ex: [e-mail] passes, [e-mail] passes, [e-mail] fails…

Can I use pattern matchers or anything else to do this validation?

I have used string parsing to capture everything after (@) and then did an equalsIgnoreCase to compare it with roin.com

This string parsing approach works, but is there any better way to do this?

Answer 1

You can try this pattern (\\S+?@roin\\.com): –

• \\S+ is used to match any non-space character
• ? after \\S+ is used to do reluctant matching. It will match least number of character to satisfy the pattern
• \\. is used to match .
• Since . is a special character in Regex, that is why we need to escape it to match it as literal.

So, here’s the code: –

String str = "[e-mail]";

Pattern pattern = Pattern.compile("\\S+?@roin\\.com");
Matcher matcher = pattern.matcher(str);

if (matcher.matches()) {
    System.out.println("Matches"); // Prints this for this email
}