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  • \$\begingroup\$ I actually had to wrap the $args[...]..' in () to be able to get it to resolve. Otherwise it was always True. \$\endgroup\$ Commented Nov 4, 2015 at 21:11
  • \$\begingroup\$ @JonathanLeech-Pepin Interesting - likely a versioning difference in how operations are ordered. I primarily code in PowerShell v4 (using the ISE); what were you using? \$\endgroup\$ Commented Nov 4, 2015 at 21:27
  • \$\begingroup\$ Happened on Win7 with the latest 5.0 rtm (August), also happens on Win10 with built-in. It is not however an issue with the pipeline version. On the other hand: param($a)$a-match'^(?!(..+)\1+$)..' works and is exactly 35 bytes as well. \$\endgroup\$ Commented Nov 4, 2015 at 21:40
  • \$\begingroup\$ @JonathanLeech-Pepin Indeed -- I just tested and confirmed on a Windows 7 machine. How strange. Yay for undocumented features :-/ ... I've corrected the code with the param($a) iteration, which should work on any version. Thanks for the assist! \$\endgroup\$ Commented Nov 4, 2015 at 21:56