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#                  /o compile pat once   (p)    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