What merlyn says is true enough, although there may be some confusion depending on what version of Perl you run merlyn's example with:

[danger:jandrew:~]$ cat blah.pl 
#!/usr/bin/perl -w
use strict;
my @data = qw/one start two three stop four/;
foreach (grep {not (/^start/../^stop/) =~ /^1?$|E/ } @data) { 
    print "o> $_\n";
}

[danger:jandrew:~]$ perl5.00503 blah.pl 
o> two
o> three

[danger:jandrew:~]$ perl5.6.1 blah.pl 
o> one
o> start
o> two
o> three
o> stop
o> four
[download]

Because, in 5.6+, the not operator with parens acts like a function (returns the negation of what's in the parens), so you'd want another set of parens to properly delimit what we want to negate (or use a unary +):

my @data = qw/one start two three stop four/;
foreach (grep {not ((/^start/../^stop/) =~ /^1?$|E/) } @data) { 
    print "o> $_\n";
}

# or:
my @data = qw/one start two three stop four/;
foreach (grep {not +(/^start/../^stop/) =~ /^1?$|E/ } @data) { 
    print "o> $_\n";
}
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.