This thing could go either way (but I disagree with your claim both ways).

Either you mean Perl is the only language that has all constructs/techniques that any other language has. That isn't true - for instance, Perl doesn't have continuations or co-routines. Or even POSIX regular expressions (always prefer to find the longest match instead of the first match).

Or you mean that Perl is the only language that can simulate or mimic constructs/techniques that any other language has. That isn't true either, because if it can be simulated in Perl, in can in C, as C is driving perl.