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[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] " (double quote)      escaping  # (pound sign), with printf( )  $ (dollar sign)     $! variable      $#ARRAY variable      $$ variable  2nd  3rd      $& variable  2nd      $* variable (deprecated)      $+ variable      $. variable  2nd      $/ variable      $; variable      $? variable  2nd  3rd  4th      $@ variable  2nd      $^F variable      $^I variable      $^O variable  2nd      $^W variable      $_ variable  2nd  3rd          accidental clobbering          outlawing unauthorized use      $` variable      $| variable  2nd      $0 variable  2nd      $1, $2, . . . (backreferences)  2nd          finding doubled words      $VERSION variable (use pragma)      hashes  % (percent sign)     %SIG hash      hashes  & (ampersand), && operator  > (right angle bracket), file-access modes  2nd  < (left angle bracket)     <&= and <& open modes      <=> numerical comparison operator      <FH> line input operator      file-access modes  2nd  <> (angle brackets)      globbing      line input operator      reading strings from binary files  ' (single quote)      escaping  ( ) (parentheses)      autouse pragma      prototyping functions      substitution  * (asterisk), typeglobs  + (plus sign), file-access modes  , (comma)     in numbers      printing lists with  - (hyphen)     -> (arrow) operator  2nd      -> (infix) notation      -0 command-line option      -a command-line option, writing filters      -e command-line option, writing filters      -i command-line option         modifying files with          writing filters      -I command-line switch      -n command-line option, writing filters      -p command-line option         modifying files with          writing filters      -t command-line option  - (minus sign), modifiers and  -C command-line switch  . (dot)     . . and . . . range operators      period in numbers  / (forward slash)     /e substitution modifier  2nd      /g pattern-matching modifier          finding Nth matches          where last pattern ended      /i pattern-matching modifier      /m pattern-matching modifier          multiple lines      /o pattern-matching modifier      /s pattern-matching modifier          multiple lines      /x pattern modifier          comments in regular expressions      root directory  : (colon)     module names      package names  = (equals sign)     => operator      =~ operator      =begin pod directive      =end pod directive  @ (at sign)     @_ array      @EXPORT array (use pragma)      @EXPORT_OK array (use pragma)      @EXPORT_TAGS array (use pragma)      @INC array      references to arrays      splice( )  [] (square brackets)      creating anonymous arrays and hashes  \ (backslash)     \1, \2, . . . (backreferences)      \a for terminal bell      \E string metacharacter      \G anchor      \L string escape      \l string escape      \U string escape      \u string escape      \X metacharacter      ` string metacharacter      creating arrays      creating references      escaping characters      references to arrays      references to scalars  _ (underscore), file stat cache  ` (backtick)     executing commands without shell escapes      expanding      gathering program output      running another program  {} (curly braces)      creating anonymous arrays and hashes  | (vertical bar)     || operator         vs. or operator          separating multiple comparisons      ||= (assignment) operator  ~ (tilde), in filenames, expanding  -0 command-line option  $0 variable

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