Und möchte, dass dieser String in 3 Einzelteile zerlegt wird, und zwar in:
Teil1
Teil2
RestRest\nRestRest…
(Man beachte das Zeilenumbruchzeichen um dritten String, es sollen dort beliebig viele vorkommen dürfen)
Bis jetzt habe ich alles mögliche um folgende Lösung probiert:
my $teil1;
my $teil2;
my $rest;
{
my @tmp = split /\n/, $text;
$teil1 = shift @tmp;
$teil2 = shift @tmp;
$rest = join("\n", @tmp);
}
Und möchte, dass dieser String in 3 Einzelteile zerlegt wird,
und zwar in:
Teil1
Teil2
RestRest\nRestRest…
(Man beachte das Zeilenumbruchzeichen um dritten String, es
sollen dort beliebig viele vorkommen dürfen)
Bis jetzt habe ich alles mögliche um folgende Lösung probiert:
Das Problem ist, dass in der letzten Klammer der Punkt ‚.‘ kein newline matched.
Zitat:
Because . doesn’t match \n. [\0-\377] is the most efficient way to match
everything currently. Maybe \e should match everything. And \E would
of course match nothing.
– Larry Wall in
Und aus perldoc -q match:
Found in /usr/share/perl/5.8/pod/perlfaq6.pod
I'm having trouble matching over more than one line. What's wrong?
Either you don't have more than one line in the string you're looking
at (probably), or else you aren't using the correct modifier(s) on your
pattern (possibly).
There are many ways to get multiline data into a string. If you want
it to happen automatically while reading input, you'll want to set $/
(probably to '' for paragraphs or "undef" for the whole file) to allow
you to read more than one line at a time.
Read perlre to help you decide which of "/s" and "/m" (or both) you
might want to use: "/s" allows dot to include newline, and "/m" allows
caret and dollar to match next to a newline, not just at the end of the
string. You do need to make sure that you've actually got a multiline
string in there.
For example, this program detects duplicate words, even when they span
line breaks (but not paragraph ones). For this example, we don't need
"/s" because we aren't using dot in a regular expression that we want
to cross line boundaries. Neither do we need "/m" because we aren't
wanting caret or dollar to match at any point inside the record next to
newlines. But it's imperative that $/ be set to something other than
the default, or else we won't actually ever have a multiline record
read in.
$/ = ''; # read in more whole paragraph, not just one line
while ( ) {
while ( /\b([\w'-]+)(\s+\1)+\b/gi ) { # word starts alpha
print "Duplicate $1 at paragraph $.\n";
}
}
Here's code that finds sentences that begin with "From " (which would
be mangled by many mailers):
$/ = ''; # read in more whole paragraph, not just one line
while ( ) {
while ( /^From /gm ) { # /m makes ^ match next to \n
print "leading from in paragraph $.\n";
}
}
Here's code that finds everything between START and END in a paragraph:
undef $/; # read in whole file, not just one line or paragraph
while ( ) {
while ( /START(.\*?)END/sgm ) { # /s makes . cross line boundaries
print "$1\n";
}
}
