You should always test to see if your match operations succeed, i.e.: 
if ( ($CardNo, $MMDD, $Type, ... ) = m{^...} ) {
  # do stuff
} else {
  warn "unable to parse this line: $_";
}

[download]
In your case, data line 14 (from what I can tell) is the short line at the end of the file. It's probably not matching your regular expression, and so lots of variables (like $TET4) are being set to undef.

In reply to Re: New to Regex and need help by pc88mxer
in thread New to Regex and need help by MKevin

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