Grepping on special characters

$OUTDOCOND = "$EGH0001_#SSSR0002_OK";
Should be
$OUTDOCOND = ‘$EGH0001_#SSSR0002_OK’;
or
$OUTDOCOND = q"$EGH0001_#SSSR0002_OK";

\# does not need \



perl -Mdiagnostics  -e '$OUTDOCOND = "$EGH0001_#SSSR0002_OK"'
Name "main::EGH0001_" used only once: possible typo at -e line 1 (#1)
    (W once) Typographical errors often show up as unique variable
    names.  If you had a good reason for having a unique name, then
    just mention it again somehow to suppress the message.  The our
    declaration is also provided for this purpose.
   
    NOTE: This warning detects package symbols that have been used
    only once.  This means lexical variables will never trigger this
    warning.  It also means that all of the package variables $c, @c,
    %c, as well as *c, &c, sub c{}, c(), and c (the filehandle or
    format) are considered the same; if a program uses $c only once
    but also uses any of the others it will not trigger this warning.
    Symbols beginning with an underscore and symbols using special
    identifiers (q.v. perldata) are exempt from this warning.
   
Use of uninitialized value $EGH0001_ in concatenation (.) or string at -e line
      1 (#2)
    (W uninitialized) An undefined value was used as if it were already
    defined.  It was interpreted as a "" or a 0, but maybe it was a mistake.
    To suppress this warning assign a defined value to your variables.
   
    To help you figure out what was undefined, perl will try to tell you
    the name of the variable (if any) that was undefined.  In some cases
    it cannot do this, so it also tells you what operation you used the
    undefined value in.  Note, however, that perl optimizes your program
    and the operation displayed in the warning may not necessarily appear
    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.