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Re: Return?
by comatose (Monk) on Apr 14, 2000 at 19:17 UTC
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In perl, there is no code for starting the next line
of text. It is something that the operating system determines.
That's why you have to use \r\n for a new line (not \n) in
MS products, \n for Unices, and \r for Macs. There might
even be something out there that wants \n\n or something
even weirder.
In any case, to avoid any wackiness, you'll want to make
sure the data is treated as a single line.
# We don't want to put text right up against itself so
# replace with a space rather than nothing. /s treats it
# all as a single line - very important.
$message =~ s/\r\n|\n|\r/ /gs;
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$message =~ s/\r|\n//g;
do the same thing as:
$message =~ s/\r\n|\n\r//g;
Your humble servant
-Chuck | [reply]
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No it wont,
The first one will blow away any newline or carrige return in the text
The second will only remove cr/lf pairs.
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Re: Return?
by chromatic (Archbishop) on Apr 14, 2000 at 19:30 UTC
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A similar question is in ASCII to HTML. To answer your direct question, I would use:
$message =~ tr/\n\r//d;
This deletes any linefeeds or carriage returns. It's much more efficient than the s/// operator. If you want to format the text for display, you might use btrott's oneliner:
$message = join "\n<p>\n", grep s/\n/<br>\n/g || 1, split /\n\n/, $message; | [reply]
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Re: Return?
by btrott (Parson) on Apr 14, 2000 at 19:23 UTC
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You may also think about using a different technique
than just testing for carriage returns; it sounds
like you'd like to use the default variable basically
if the user didn't post any "good text" in the text box.
So if they just posted whitespace (whether that be tabs,
spaces, or carriage returns), you'd like to use the
default variable.
In that case, use something like this:
$variable = "Some Default Messsage"
unless $variable =~ /\S/;
This sets variable to the default unless it contains a
non-whitespace character. | [reply]
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Re: Return?
by Anonymous Monk on Apr 14, 2000 at 22:49 UTC
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Ok, thanx, I solved that problem!
Now this:
How can I see if the textbox contains ONLY spaces and nothing else?
I don't need code that checks for carriage returns and all, just for spaces.
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my $string = " ";
$string = "Default" if $string =~ /^ *$/;
This sets $string to "Default" if $string consists of
0 or more space characters, and only space characters;
if $string is " a " or something such, the regular
expression won't match.
If you're looking to match strings that consist only of
whitespace (no non-whitespace characters), use:
my $string = " \t \n ";
$string = "Default" if $string =~ /^\s*$/;
\s matches whitespace, so this does the same as the last
regex, but matches any whitespace (not just space characters). | [reply]
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Re: Return?
by wouter (Sexton) on Apr 14, 2000 at 18:52 UTC
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I ran into the same problem a year ago while writing my first 'big' cgi script... I had a textarea called 'message', and i wanted to change newlines in
breaks. This is how i did it:
# change newline into
, and return into nothing
$message =~ s/\n/
/g;
$message =~ s/\r//g;
I figure the problem is that on a Windows platform, window is sending a linefeed AND hard return, while *NIX is linefeed only (and mac being hard return only, but haven't tested that out yet)
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Just an FYI .. The returns on the different platforms are:
*nix: \n
Mac: \r
Windows: \r\n
That it :-)
philip
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Re: Return?
by wouter (Sexton) on Apr 14, 2000 at 18:52 UTC
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I ran into the same problem a year ago while writing my first 'big' cgi script... I had a textarea called 'message', and i wanted to change newlines in <BR> breaks. This is how i did it:
# change newline into <BR>, and return into nothing
$message =~ s/\n/<BR>/g;
$message =~ s/\r//g;
I figure the problem is that on a Windows platform, window is sending a linefeed AND hard return, while *NIX is linefeed only (and mac being hard return only, but haven't tested that out yet)
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