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Editorial Team
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Asked: 2026-06-06T21:46:25+00:00

I am working with regular expressions to transform HTML into BBCODE. But, with code

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I am working with regular expressions to transform HTML into BBCODE. But, with code coming from farmer WYSIWYG editors (TinyMce) I am getting issues. It is a very curious case:

There are some typical blank pharagraphs, <p>&nbsp;</p>, but I cannot match them in any way. No one of the folllowing regexp’s are working:

str_replace("<p>&nbsp;</p>",........)
str_replace("<p> </p>".........)
preg_replace("#<p>.?</p>#"....)

This DOES work, but what if the “spaces” are in other places, how could I match them?:

preg_replace("#<p>.{1,6}</p>#"....)

How can I get it to match all the &nbsp; even if they aren’t written (in the BD, where the original string is stored, the &nbsp; are not written, there are just <p> </p> blocks) It is quite strange…

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1 Answer

  1. Editorial Team

    I recommend you to read Unicode Regular Expressions and Wikipedia: Unicode Whitespace character.

    Script:

    $string = '123<p>  &nbsp;  &nbsp;  </p>abc';
$pattern = '/<p>(&nbsp;|[\s\p{Z}\p{C}\x85\xA0\x{0085}\x{00A0}\x{FFFD}]+)*<\/p>/iu'; 
$replacement = ''; 
echo preg_replace($pattern, $replacement, $string);

    Output:

    123abc

    Note: To match any single unicode grapheme use pattern \P{M}\p{M}*+

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