This is documented in perlref. In general, this is fraught with quoting and readability problems, but it is possible. To interpolate a subroutine call (in list context) into a string:
print "My sub returned @{[mysub(1,2,3)]} that time.\n";If you prefer scalar context, similar chicanery is also useful for
arbitrary expressions:
print "That yields ${\($n + 5)} widgets\n";Version 5.004 of Perl had a bug that gave list context to the
expression in ${...}, but this is fixed in version 5.005.
See also ``How can I expand variables in text strings?'' in this section of the FAQ.