java - Parsing Email Address to fetch domain and comparing it - Stack Overflow

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I have a requirement where in a request containing field es 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

For ex: [email protected] passes, [email protected] passes, [email protected] 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 pare it with roin

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

I have a requirement where in a request containing field es 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.

For ex: [email protected] passes, [email protected] passes, [email protected] 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 pare it with roin.

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

• java
• javascript
• regex
• string
• pattern-matching

Share Improve this question Follow edited Oct 17, 2012 at 17:39 Rohit Jain 213k4545 gold badges414414 silver badges533533 bronze badges asked Oct 17, 2012 at 17:22 user1717230user1717230 45311 gold badge1515 silver badges3131 bronze badges 1

• 4 Why to use regex? Take the 9 last character of the string and check if they are @roin. – SJuan76 Commented Oct 17, 2012 at 17:26

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1 Answer 1

Sorted by: Reset to default 6

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

• \\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 = "[email protected]";

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

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

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