The simple explanation is: when you define a sub X, do not put parens, () after the name.
That's it.
sub X(){} means something very different than just sub X{}.
I would go as far as to say that you never have to, and normally should not put any (....stuff...) after the sub's name.
-What you have done with shift is 100% correct.
-Maybe chomp() is not necessary, but it doesn't "hurt".
-A more important point for me is to indent the lines within the subroutine by either 3 or 4 spaces.
"Prototype failure" example:
#!/usr/bin/perl -w use strict; # This sequence works, although with a warning... # because Perl hasn't yet seen subroutine X. X("xyz"); sub X() # this means that subroutine X cannot # be called with any arugment at all. # sub X(); #is ok, # sub X("abc"); #is not ok. { my $input = shift; print "$input\n"; } #this would fail to produce a result - program fails to compile # X("abc"); # because now that subroutine X() has been seen, it is understood # that no arguments can be passed to it. __END__ prints: main::X() called too early to check prototype at C:\TEMP\prototypes.pl + line 4. xyz
In reply to Re^3: Regex with multiple pattern omissions
by Marshall
in thread Regex with multiple pattern omissions
by jhoop
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