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Replacing "/[^>][\n\r]+/" with "<br />\n"

Hi all,

I would like to replace line breaks such '[\n\r]+' with '<br />'. Easy
task. Problems start when I try to only replace lines that do not end
with HTML tags.
I tried preg_replace("/[^>][\n\r]+/", "<br />\n") but this does not
seem to work.
An example to better understand what I would like to achieve:

first line
third line

should give:

first line<br />
third line<br />

Any help would be grateful appreciated. Thanks and have a nice day,


Jul 17 '05 #1
3 3161
ri******@stud.u nibas.ch wrote:
Hi all,

I would like to replace line breaks such '[\n\r]+' with '<br />'. Easy
task. Problems start when I try to only replace lines that do not end
with HTML tags.
I tried preg_replace("/[^>][\n\r]+/", "<br />\n") but this does not
seem to work.

I've been guilty of gymnastics with regexes in the past, but these days I
prefer the simple, readable route:

//$line = "<test>\n";
$line = "test\n";
if( !preg_match( '/>[\n\r]+$/', $line ) ) {
$line = preg_replace("/[\n\r]+$/", "<br />\n", $line );
echo $line;

Not tested, but it looks about right. :o)

The email address used to post is a spam pit. Contact me at
http://www.derekfountain.org : <a
href="http://www.derekfounta in.org/">Derek Fountain</a>
Jul 17 '05 #2

<ri******@stud. unibas.ch> wrote in message
news:11******** **************@ g14g2000cwa.goo glegroups.com.. .
Hi all,

I would like to replace line breaks such '[\n\r]+' with '<br />'. Easy
task. Problems start when I try to only replace lines that do not end
with HTML tags.
I tried preg_replace("/[^>][\n\r]+/", "<br />\n") but this does not
seem to work.
An example to better understand what I would like to achieve:

That wouldn't work correctly when you have a "\r\n" after a tag, since "\n"
would match as it doesn't immediately follow >.

Converting "\r\n" to "\n" first will make life easier:

$text = str_replace("\r \n", "\n", $text);
$text = preg_match('/(?<!>)\n/', "<br />\n", $text);
(?<! ... ) is a lookbehind negative assertion. It means that the preceding
text should not match the pattern (an < in this case).
Jul 17 '05 #3
Try the nl2br() function:


"Given a string, convert any line breaks to <br>"

Jul 17 '05 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

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