Interval operators {} in web_reg_save_param_regexp

I am attempting to correlate data coming back from the AUT server.  

My regexp is:

     web_reg_save_param_regexp("ParamName=Application", "RegExp=Application-([\d-]{4,})\'", LAST);

My (very abbreviated) server response looks like:

'xyzvalue','69553','Application--1431562213-1599432006','', 'Container=Application')" >Correspondence</a></li>

According to this page vugen uses the PCRE regular expression engine

According to this PCRE regex checker the regex should match

However, I receive this error from vugen:

Error -35049: No match found for the requested parameter "Application". Check whether the requested regular expression exists in the response data  [MsgId: MERR-35049]

One thing to note is that vugen throws a warning saying:

Action.c(286): Warning: The string '4,' with parameter delimiters is not a parameter.

So... does vugen understand when to apply a regex interval operator and when to apply a parameter?  Or am I missing something here?