Regex Negation on a set of strings

Question

In the following string:

<table  border="1"><tr><td class=" m" bgcolor="#cccccc" style="bold" size="7" m="m "><span></span> </td><td class=" m" bgcolor="#cccccc" style="bold" size="7" m="m " align="center">NAMES </td><td class=" m" bgcolor="#cccccc" style="bold" size="7" m="m " colspan="13" align="center">AREAS </td></tr></table>

I'd like to remove all attributes other than the following: border,bgcolor and class.

^(?:border|class|bgcolor)\b))=".*?"

doesn't work out. Any suggestions please?

You can use a regex for that. But it's only advisable for output transformation, not as security feature. A regex would be too much overhead to cover the various legal serializations. — mario, Jan 19 '12 at 00:18

score 2 · Answer 1 · edited May 23 '17 at 10:24

2

preg_replace('/ (?!(border|class|bgcolor))[^=" ]+="[^"]*"/', '', $str);

See it here in action: http://regexr.com?2vp0m

That said, please don't use a regex to parse HTML!!!

edited May 23 '17 at 10:24

Community

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answered Jan 19 '12 at 00:12

Joseph Silber

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+1 for a good answer (and thanks for the link to RegExr, I hadn't seen it before - looks useful!) – Stuart Golodetz Jan 19 '12 at 00:25
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@StuartGolodetz - I use it here for all my answers on regex's. It's the easieat way to demonstrate that what you're doing actually works! – Joseph Silber Jan 19 '12 at 00:28

Regex Negation on a set of strings

1 Answers1