Thanks for the tip on the wording. This is what I thought I was using: "In computer science, the syntax of a computer language is the set of rules that defines the combinations of symbols that are considered to be a correctly structured document or fragment in that language."
Wikipedia Syntax
I will come up to speed eventually!

I uncommented out "use diagnostics". I don't mean to be dense, but, I still can't figure out what I am doing wrong? What is the correct structure?

$ ./LeftToRight.pl
Use of uninitialized value $_ in substitution (s///) at ./LeftToRight.
+pl line
    12 (#1)
    (W uninitialized) An undefined value was used as if it were alread
+y
    defined.  It was interpreted as a "" or a 0, but maybe it was a mi
+stake.
    To suppress this warning assign a defined value to your variables.
    
    To help you figure out what was undefined, perl will try to tell y
+ou
    the name of the variable (if any) that was undefined.  In some cas
+es
    it cannot do this, so it also tells you what operation you used th
+e
    undefined value in.  Note, however, that perl optimizes your progr
+am
    anid the operation displayed in the warning may not necessarily ap
+pear
    literally in your program.  For example, "that $foo" is usually
    optimized into "that " . $foo, and the warning will refer to the
    concatenation (.) operator, even though there is no . in
    your program.
    
Use of uninitialized value $RedirectUrl in concatenation (.) or string
+ at
    ./LeftToRight.pl line 13 (#1)
for at the end: $RedirectUrl = <>

Use of uninitialized value $RedirectUrl in substitution (s///) at
    ./LeftToRight.pl line 15 (#1)
Use of uninitialized value $RedirectUrl in concatenation (.) or string
+ at
    ./LeftToRight.pl line 16 (#1)
run on line: $RedirectUrl = <>

Use of uninitialized value $_ in substitution (s///) at ./LeftToRight.
+pl line
    18 (#1)
Use of uninitialized value $RedirectUrl in concatenation (.) or string
+ at
    ./LeftToRight.pl line 19 (#1)
for at the start: $RedirectUrl = <>

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In reply to Re^2: Need help with loop syntax errors (warnings) by Todd Chester
in thread Need help with loop syntax errors by Todd Chester

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