I have the control (1201 - Status of the 'root user's $PATH variable' (if dot '.' exists) and current list of 'root-owned directories') included in my UNIX policy. This control is failing even when the actual $PATH variable does not contain a '.'. I checked the regular expression using the RegexTester (http://regexpal.com/) and turns out that the regular expression is triggering on the string "::" (double colon) that is in the $PATH variable. My background is the Windows operating system, so my question is, what is the significance for checking for the double colon?