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how-to strip empty HTML tags like <b> </b>

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Contributed by russmann on Sep 06, 2001 at 04:03 UTC
Q&A  > regular expressions


Answer: how-to strip empty HTML tags like b /b
contributed by tachyon

A more complete option is not Perl. Use HTML Tidy which is by w3c's Dave Raggett. I just tested it and it will strip empty tags a well as a doing many other useful things. Get your free copy here http://www.w3.org/People/Raggett/tidy/ or get a Win32 GUI version here http://perso.wanadoo.fr/ablavier/TidyGUI/

Answer: how-to strip empty HTML tags like b /b
contributed by tachyon

The normal answer would be use HTML::TokeParser if you want a reliable solution to parse HTML. For this *particular* task a well constructed regex should suffice. This will strip all the <b> </b> tags that are empty. I believe it covers all bases.

$text = join '', <DATA>; print $text; $text =~ s#<\s*b\s*>(?:[\s\n]|&nbsp;)*<\s*/\s*b\s*>##ig; print $text; __DATA__ <p>test <p>test<b></b> <p>test<b >&nbsp; </b> <p>test<b> </b> <p>test<b ></b > <p>test<B></B> <p>test<B> </B> <p>test<B ></B> <p>test<B > </B > <p>test<B> &nbsp; &nbsp; </B> <p><b>I am not empty!</b>
Answer: how-to strip empty HTML tags like b /b
contributed by Hofmator

I'd also go with tachyon's suggestion of HTML Tidy, but if you are trying to do this quick and dirty somewhere in the middle of a script, I'd use this regex $text =~ s#<\s*([^>]*)\s*>[\s\n]*<\s*/\s*\1\s*>##ig;
It should remove any empty tags which don't contain any attributes (not just bold tags), so it works on

__DATA__ <i> </ I> < B ></b> < em> < / eM >

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