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pl@nereida:~/Lperltesting$ cat ./calc510withactions2.pl
#!/usr/local/lib/perl/5.10.1/bin//perl5.10.1
...
else {
  say "does not match";
}

pl@nereida:~/Lperltesting$ ./calc510withactions2.pl
2-8*4/2/4-1
matches: 2-8*4/2/4-1
Stack=(2 8 4 * 2 / 4 / - 1 -)