TDM classifier for ACN is not tagging it in the PII scan

Products

• CA Test Data Manager (Data Finder / Grid Tools)

Issue/Introduction

A classifier with the following regex was created to tag an ACN number (3 digits - space - 3 digits - space - 3 digits).
"value":"^[0-9]{3}[[:space:]][0-9]{3}[[:space:]][0-9]{3}$"
But the ACN number is not getting tagged.

Environment

TDM Portal all supported releases

Resolution

The following regex is an example that tags an ACN number in a nchar(20) column:
"value":"^[0-9]{3}[ ][0-9]{3}[ ][0-9]{3}[ ]*"