Regular expressions in Fitnesse Tables

I am trying to process a string with a date in Fitnesse

"2016-06-09T15:20:03.336+01:00 @ Perspective editor; User: admin"

The date part of the string will change on every test run.

My understanding is I can use =~/regex here/ in my results table i.e.

|name|Change String|Status|
|ui-comp/P1 Test Perspective.txt|=~/[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}+01:00 @ Perspective editor; User: admin/|ADDED|

AFAIK the regex is good and should work

Still my test fails with:

=~/[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{3}+01:00 @ Perspective editor; User: admin/ expected

2016-06-09T15:20:03.336+01:00 @ Perspective editor; User: admin actual

Any ideas what I am doing wrong here ?

The java code simply fetches some table rows via selenium and puts them in a setFixture

  @Override
  public SetFixture getEventTable() throws Exception {
    return new SetFixture(getTableElement('EventTable').getRows('added'));
}