#### Examples of RegEx usage

The regular expression is required to extract device name from the X509 certificate's common name.
The regular expression syntax is based on Java [Pattern](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html).
You may also use this [resource](https://regex101.com/) to test your expressions but make sure you select Java 8 flavor.

* **Pattern:**<code>(.*)\.company.com</code>- matches any characters before the ".company.com".
  <br>**CN sample:**<code>DeviceA.company.com</code>
  <br>**Result:**<code>DeviceA</code>

* **Pattern:** <code>(.*)@company.com</code>- matches any characters before the "@company.com".
  <br>**CN sample:**<code>DeviceA@company.com</code>
  <br>**Result:**<code>DeviceA</code>

* **Pattern:** <code>prefix(.*)suffix@company.com</code>- matches characters between "prefix" and "suffix@company.com".
  <br>**CN sample:**<code>prefixDeviceAsuffix@company.com</code>
  <br>**Pattern matches:** <code>DeviceA</code>

* **Pattern:** <code>\\D+\\.(.*)\\.\\d+@company.com</code>- matches characters between not digits prefix followed by period and sequence of digits with "@company.com" ending.
  <br>**CN sample:**<code>region.DeviceA.220423@company.com</code>
  <br>**Pattern matches:** <code>DeviceA</code>