I'd like to change <pre> with <code> and </pre> with </code>.
I'm having problem with the slash / and regex.
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In general, it's not a good idea to parse HTML with regex, but for this simple example, I suppose it couldn't hurt.Mike Sherov– Mike Sherov2010-07-30 23:27:35 +00:00Commented Jul 30, 2010 at 23:27
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I'm modifying a wordpress plug-in and this is the way they do it.Juanjo Conti– Juanjo Conti2010-07-30 23:28:30 +00:00Commented Jul 30, 2010 at 23:28
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I agree that it's fine for this example. Was just giving a heads up about deeper complexities.Mike Sherov– Mike Sherov2010-07-30 23:32:43 +00:00Commented Jul 30, 2010 at 23:32
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1As admirable WordPress the application is at meeting its goals, never assume anything related to the WordPress codebase is a good general example.Weston C– Weston C2010-07-30 23:33:03 +00:00Commented Jul 30, 2010 at 23:33
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3 Answers
You could just use str_replace:
$str = str_replace(array('<pre>', '</pre>'), array('<code>', '</code>'), $str);
If you feel compelled to use regexp:
$str = preg_replace("~<(/)?pre>~", "<\\1code>", $str);
If you want to replace them separately:
$str = preg_replace("~<pre>~", '<code>', $str);
$str = preg_replace("~</pre>~", '</code>', $str);
You just need to escape that slash.
answered Jul 30, 2010 at 23:27
NullUserException
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2 Comments
Juanjo Conti
Could you show the preg_replace splited in 2 sentences, one per tag? Thanks
Devner
@NullUserException What if there were attributes mentioned in the
<pre> tag and you had to retain them exactly as they are and just replace the <pre part of it? For example, how would you change <span style="padding: 10px;">Test</span> to <div style="padding: 10px;">Test</div> ?You probably need to escape the /s with \s, or use a different delimiter for the expression.
Instead, though, how about using str_replace? <pre> and </pre> will be easy to match as they're not likely to contain any classnames or other attributes.
$text=str_replace('<pre>','<code>',$text);
$text=str_replace('</pre>','</code>',$text);
4 Comments
Devner
What if there were attributes mentioned in the
<pre> tag and you had to retain them exactly as they are and just replace the <pre part of it? For example, how would you change <span style="padding: 10px;">Test</span> to <div style="padding: 10px;">Test</div> ?
JAL
You just replace '<span' with '<div' and '</span>' with '<\div>'.
Devner
Thanks for the reply. I knew I could do that, but what wanted to find out how to tackle this case when I have an occurrence of the <span> tag within my body content. Because the replace will replace all occurrences and I need to replace only the class names and not all occurrences. How do I go about this?
JAL
You mean, only spans that have a certain class attribute? You'll need to use a regex. I suggest to post a new question or search for previous ones that use regex.
I found a very easy solution to replace multiple words in a string :
<?php
$str="<pre>Hello world!</pre>";
$pattern=array();
$pattern[0]="/<pre>/";
$pattern[1]="/<\/pre>/";
$replacement=array();
$replacement[0]="<code>";
$replacement[1]="</code>";
echo preg_replace($pattern,$replacement,$str);?>
output :
<code>Hello world!</code>
With this script you can replace as many words in a string as you want :
just place the word (that you want to replace) in the pattern array , eg :
$pattern[0]="/replaceme/";
and place the characters (that will be used in place of the replaced characters) in the replacement array, eg :
$replacement[0]="new_word";
Happy coding!
