Programming Forums > Web Development and Design > PHP

Simon Gray · Sep 4th, 2005, 6:15 AM

How would I replace all <br /> tags inside a <pre></pre> block using the perl regular expressions function, preg_replace(), in PHP? I'm having a hard time accomplishing this.

Ooble · Sep 4th, 2005, 6:37 AM

You don't need preg_replace - just str_replace. Look it up: www.php.net

Simon Gray · Sep 4th, 2005, 7:12 AM

Uh no? Did you skip the part where it said inside a pre tag ?

I don't want all <br />s replaced.

Lich · Sep 4th, 2005, 9:51 AM

uhm, I dunno. Str_replace() maybe?

Polyphemus_ · Sep 4th, 2005, 10:09 AM

Quote:

Originally Posted by Lich

uhm, I dunno. Str_replace() maybe?

lol, that's what ooble just said, and that was wrong

I found this on the internet at http://www.cs.wcupa.edu/~rkline/perl2php/:

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Perl:                   PHP:
$s =~ s/\s+/X/;         $s = preg_replace( "/\s+/", 'X', $s, 1 );
$s =~ s/\s+/X/g;        $s = preg_replace( "/\s+/", 'X', $s );

Ooble · Sep 4th, 2005, 4:03 PM

OK...
[php]$string = preg_replace('#(?<=<pre>.*)<br />(?=</pre>)#m', '', $string);[/php]
That should do it. I'll explain it when I've eaten my dinner.

Simon Gray · Sep 6th, 2005, 3:02 PM

Gives me a parse error =/

Ooble · Sep 6th, 2005, 3:53 PM

Argh... I'll work on it now. Gimme a few secs.

EDIT: got it. Just removed the fancy crap:

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$stuff = preg_replace('#(<pre>.*)<br />(.*</pre>)#m', '$1$2', $stuff);

Simon Gray · Sep 7th, 2005, 8:22 AM

K, I was working on something similar, but the problem is it only replaces the last occurence of such a tag.

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$text = "<pre>Sentence one<br />two<br />three</pre>";
$text = preg_replace('#(<pre>.*)<br />(.*</pre>)#m', '$1$2', $text);

This outputs

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<pre>Sentence one<br />twothree</pre>

Simon Gray · Sep 7th, 2005, 10:29 AM

Maybe it's because I'm misguided? I was under the impression preg_replace() worked recursively until all <br />s had been replaced, but maybe I'm wrong.

Anyway, this works for me, but I'm not happy about it =/

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while (preg_match('#(<pre>.*)<br />(.*</pre>)#m', $text)) {
  		$text = preg_replace('#(<pre>.*)<br />(.*</pre>)#m', "$1\n$2", $text);
 }

Sep 4th, 2005, 6:15 AM	#1
Simon Gray Programmer Join Date: Aug 2005 Location: �lsg�rde, Denmark Posts: 62 Rep Power: 4	Regex help How would I replace all <br /> tags inside a <pre></pre> block using the perl regular expressions function, preg_replace(), in PHP? I'm having a hard time accomplishing this. __________________ Visit my blog, about all that stuff in between your nostrils >_>

Sep 4th, 2005, 6:37 AM	#2
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	You don't need preg_replace - just str_replace. Look it up: www.php.net __________________ Me :: You :: Them

Sep 4th, 2005, 7:12 AM	#3
Simon Gray Programmer Join Date: Aug 2005 Location: �lsg�rde, Denmark Posts: 62 Rep Power: 4	Uh no? Did you skip the part where it said inside a pre tag ? I don't want all <br />s replaced. __________________ Visit my blog, about all that stuff in between your nostrils >_>

Sep 4th, 2005, 9:51 AM	#4
Lich Professional Programmer Join Date: May 2005 Location: Detroit Posts: 254 Rep Power: 4	uhm, I dunno. Str_replace() maybe? __________________ --John Cruz Web Developer www.cruzweb.net

Sep 4th, 2005, 4:03 PM	#6
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	OK... [php]$string = preg_replace('#(?<=<pre>.*)<br />(?=</pre>)#m', '', $string);[/php] That should do it. I'll explain it when I've eaten my dinner. __________________ Me :: You :: Them

Sep 6th, 2005, 3:02 PM	#7
Simon Gray Programmer Join Date: Aug 2005 Location: �lsg�rde, Denmark Posts: 62 Rep Power: 4	Gives me a parse error =/ __________________ Visit my blog, about all that stuff in between your nostrils >_>

Sep 6th, 2005, 3:53 PM	#8
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Argh... I'll work on it now. Gimme a few secs. EDIT: got it. Just removed the fancy crap: (Toggle Plain Text) $stuff = preg_replace('#(<pre>.)<br />(.</pre>)#m', '$1$2', $stuff); $stuff = preg_replace('#(<pre>.)<br />(.</pre>)#m', '$1$2', $stuff); __________________ Me :: You :: Them

Sep 7th, 2005, 8:22 AM	#9
Simon Gray Programmer Join Date: Aug 2005 Location: �lsg�rde, Denmark Posts: 62 Rep Power: 4	K, I was working on something similar, but the problem is it only replaces the last occurence of such a tag. (Toggle Plain Text) $text = "<pre>Sentence one<br />two<br />three</pre>"; $text = preg_replace('#(<pre>.)<br />(.</pre>)#m', '$1$2', $text); $text = "<pre>Sentence one<br />two<br />three</pre>"; $text = preg_replace('#(<pre>.)<br />(.</pre>)#m', '$1$2', $text); This outputs (Toggle Plain Text) <pre>Sentence one<br />twothree</pre> <pre>Sentence one<br />twothree</pre> __________________ Visit my blog, about all that stuff in between your nostrils >_>

Sep 7th, 2005, 10:29 AM	#10
Simon Gray Programmer Join Date: Aug 2005 Location: �lsg�rde, Denmark Posts: 62 Rep Power: 4	Maybe it's because I'm misguided? I was under the impression preg_replace() worked recursively until all <br />s had been replaced, but maybe I'm wrong. Anyway, this works for me, but I'm not happy about it =/ (Toggle Plain Text) while (preg_match('#(<pre>.)<br />(.</pre>)#m', $text)) { $text = preg_replace('#(<pre>.)<br />(.</pre>)#m', "$1\n$2", $text); } while (preg_match('#(<pre>.)<br />(.</pre>)#m', $text)) { $text = preg_replace('#(<pre>.)<br />(.</pre>)#m', "$1\n$2", $text); } __________________ Visit my blog, about all that stuff in between your nostrils >_>

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Programming Forums > Web Development and Design > PHP

Regex help