Over a million developers have joined DZone.

Regular Expression to Validate a Comma-Separated List of Email Addresses

Need to validate a CSV-formatted list of email addresses? Check out this regular expression and how to use it!

· Java Zone

Learn more about the advantages of moving from a monolithic to microservices architecture.  Brought to you in partnership with IBM.

EDIT It has already been pointed out by several readers that this expression doesn't handle a number of common cases. See the comments or the original blog entry for an updated version.

Recently I needed to create a regular expression to validate the format of a comma-separated list of email addresses. Just thought I’d share the result in case it is of use to anyone:


Here’s an example of applying the pattern in Java:

// Compile pattern
Pattern emailAddressPattern = Pattern.compile(String.format("%1$s(,\\s*%1$s)*", "\\w+@\\w+\\.\\w+"));

// Validate addresses
System.out.println(emailAddressPattern.matcher("xyz").matches()); // false
System.out.println(emailAddressPattern.matcher("foo@bar.com").matches()); // true
System.out.println(emailAddressPattern.matcher("foo@bar.com, xyz").matches()); // false
System.out.println(emailAddressPattern.matcher("foo@bar.com, foo@bar.com").matches()); // true

From Idea to Application gives you the architecture to quickly build, manage and run a range of applications (web, mobile, big data, new smart devices, etc.) on an open-standard, cloud-based platform. See why developers are using IBM Bluemix. Brought to you in partnership with IBM.

expression,pattern,regular expression,email,csv

Published at DZone with permission of Greg Brown, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

The best of DZone straight to your inbox.

Please provide a valid email address.

Thanks for subscribing!

Awesome! Check your inbox to verify your email so you can start receiving the latest in tech news and resources.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}