CliTemplates/Apache Velocity Template Language - split function

• Looking for  a sample Cisco Prime CliTemplate making use of split. Want to feed in a variable containing a /48 IPv6 prefix and then use parts of it in various sections of the device configuration. 
• So for example would like to take '2001:DB8::/48' split on say '::'
• Giving me '2001:DB8' in a variable which can be appended '::/64' to use on an interface. 
• Have tried the examples shown here but it breaks the template in Prime: apache - Using velocity split() to split a string into an array doesnt seem to work - Stack Overflow
•  Taken from the link about, should something like the below work (Giving me 'This'). 

#set ($myString = “This|is|my|dummy|text”)

#set ($myArray = $myString.split("\|"))

$myArray[0]

 The CLI content that you're looking for is more like this 

#set ( $ipv6_64subnet = $ipv6_string.split("::")[0].concat("::/64") )

do_work $ipv6_64subnet 

Have put that in an XML payload that you can POST to v1/op/cliTemplateConfiguration/upload.  It worked as expected on my 3.1.5 (dev build of the 3.1.5 patch) server when deployed via either the API or GUI. 

<?xml version="1.0" ?>
<cliTemplate>
  <content>#set ( $ipv6_64subnet = $ipv6_string.split("::")[0].concat("::/64") )
do_work $ipv6_64subnet</content>
  <description>carl_test</description>
  <deviceType>Routers</deviceType>
  <name>carl_test_api</name>
  <variables>
<variable>
<description>IPv6 String</description>
<displayLabel>IPv6 String</displayLabel>
<name>ipv6_string</name>
<required>true</required>
<type>String</type>
</variable>
</variables>
</cliTemplate>