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  1. or download this
    do_something() if <condition>;
if (<condition>) { do_something(); }
  2. or download this
    m[regex]
m|regex|
m/regex/
/regex/
  3. or download this
    "string-with-expanded-$variables"
qq[string-with-expanded-$variables]
qq/string-with-expanded-$variables/
  4. or download this
    'string-expanding-no-variables'
q[string-expanding-no-variables]
q/string-expanding-no-variables/