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 CONTEXTS SIGILS ref ARRAYS HASHES  void $scalar SCALAR @array %hash 
scalar @array ARRAY @array[0, 2] @hash{'a', 'b'}  list
%hash HASH $array[0] $hash{'a'}  &sub CODE  *glob GLOB SCALAR
VALUES  FORMAT number, string, ref, glob, undef  REFERENCES  \
reference $$foo[1] aka $foo->[1]  $@%&* dereference $$foo{bar} aka
$foo->{bar}  [] anon. arrayref ${$$foo[1]}[2] aka
$foo->[1]->[2]  {} anon. hashref ${$$foo[1]}[2] aka
$foo->[1][2]  \()  list of refs  SYNTAX  OPERATOR PRECEDENCE
foreach (LIST) { } for (a;b;c) { }  -> while (e) { } until (e)  { } 
++ -- if (e) { } elsif (e) { } else { }  ** unless (e) { } elsif (e) { }
else { }  ! ~ \ u+ u- given (e) { when (e) {} default {} }  =~ !~  *
/ % x NUMBERS vs STRINGS FALSE vs TRUE  + - .  = = undef, "", 0, "0" 
<< >> + .  anything else  named uops == != eq ne  <
> <= >= lt gt le ge < > <= >= lt gt le ge  ==
!= <=> eq ne cmp ~~ <=> cmp  &  | ^ REGEX MODIFIERS
REGEX METACHARS  && /i case insensitive ^ string begin  || // /m line
based ^$ $ str end (bfr \n)   .. ...  /s . includes \n + one or more 
?: /x /xx ign. wh.space * zero or more  = += last goto /p preserve ? zero
or one  , => /a ASCII /aa safe {3,7} repeat in range  list ops /l
locale /d dual | alternation  not /u Unicode [] character class  and /e
evaluate /ee rpts \b boundary  or xor /g global \z string end  /o
compile pat once ()  capture  DEBUG (?:p)  no capture  -MO=Deparse REGEX
CHARCLASSES (?#t)  comment  -MO=Terse .  [^\n] (?=p)  ZW pos ahead 
-D## \s whitespace (?!p)  ZW neg ahead  -d:Trace \w word chars
(?<=p) ZW pos behind \K  \d digits (?<!p) ZW neg behind 
CONFIGURATION \pP named property (?>p)  no backtrack  perl -V:ivsize
\h horiz.wh.space (?|p|p)branch reset  \R linebreak (?<n>p)named
capture  \S \W \D \H negate \g{n} ref to named cap  \K keep left
part  FUNCTION RETURN LISTS  stat localtime caller SPECIAL VARIABLES 
0 dev 0 second 0 package $_ default variable  1 ino 1 minute 1 filename $0
program name  2 mode 2 hour 2 line $/ input separator  3 nlink 3 day 3
subroutine $\ output separator  4 uid 4 month-1 4 hasargs $| autoflush 
5 gid 5 year-1900 5 wantarray $! sys/libcall error  6 rdev 6 weekday 6
evaltext $@ eval error  7 size 7 yearday 7 is_require $$ process ID  8
atime 8 is_dst 8 hints $.  line number  9 mtime 9 bitmask @ARGV command
line args  10 ctime 10 hinthash @INC include paths  11 blksz 3..10 only
@_ subroutine args  12 blcks with EXPR %ENV environment