do_something() if <condition>;
if (<condition>) { do_something(); }

##</code><code>##

m[regex]
m|regex|
m/regex/
/regex/

##</code><code>##

"string-with-expanded-$variables"
qq[string-with-expanded-$variables]
qq/string-with-expanded-$variables/

##</code><code>##

'string-expanding-no-variables'
q[string-expanding-no-variables]
q/string-expanding-no-variables/