Useful Regex Examples for Targeting

Split targeting rules support matching regex (regular expression) to serve specific treatment, Regex is a powerful tool to filter a wide spectrum of population with one line of text. It’s recommended that you test your regex on an external tool to verify it works correctly. Here is one suggested site

Below are a few useful examples.

Target specific app major version
To target users with app version greater than or equal to 4.5 to get the on treatment, this regex could be used for matching the appVersion attribute:
([5-9]\.[0-9]|[4]\.[5-9]).*

Example of passing the appVersion attribute for Javascript SDK:

var attributes = {appVersion: "4.567.33"};

Target all population of specific domain of user emails
For this example, to serve the on treatment for all employees of split.io, we can use the Regex below for email attribute:
@split\.io$

Example of passing the email attribute for Javascript SDK:

var attributes = {email: "bilal@split.io"};

Target users on Chrome version 20 and later
This example we are serving the on treatment to Chrome users only. However, we want to only use Chrome versions 20 and later for compatibility reasons. The attribute passed is userAgent:
Chrome\/[2-9][0-9]\.

Example for Javascript SDK:

var attributes = {userAgent: "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.93 Safari/537.36"};

Target English speaking users world wide
An experiment is designed for English speaking users in any country by detecting the default language setting in the browser, the attribute passed is navigatorLanguage
en-.

Example for Javascript SDK:

var attributes = {navigatorLanguage: navigator.language};

Target specific URL
To target an experiment that applies only to users that land on a specific URL, the extracted URL can be passed as an attribute to the targeting rule:
http:\/\/mysite\.com\/my_url

Example for Javascript SDK:

var attributes = {url: window.location.href};