PHP regex to match HTML tag names except some tags

Question

I'm trying to match any open HTML tag except input tag using regular expression in PHP. Here is my pattern.

/<([a-z]+)([^>]*>)?/i

It matches all below:

<input type="text">
<img src=">
<a href="">
<button type="button"></button>
<div id="some"></div>
<p></p>

I don't want to match input. I may exclude more tags in the future as I stated some tags in my question title.

What I've tried so far

[Edit]

As per my example, I also want to keep the tag name only returned in the matched results, e.g, img, a, button, div, p, etc.

Don't use regular expressions to parse HTML. Use a proper HTML parsing module. You cannot reliably parse HTML with regular expressions, and you will face sorrow and frustration down the road. As soon as the HTML changes from your expectations, your code will be broken. See htmlparsing.com/php or this SO thread for examples of how to properly parse HTML with PHP modules that have already been written, tested and debugged. — Andy Lester
– Andy Lester, Commented Jan 2, 2015 at 15:33

vks · Accepted Answer · 2015-01-02 14:27:59Z

2

<(?:(?!input)[^>])*>(?:<\/[^>]*>)?

Try this.See demo.

https://www.regex101.com/r/fG5pZ8/13

$re = "/<(?:(?!input)[^>])*>(?:<\\/[^>]*>)?/im";
$str = "<input type=\"text\">\n<img src=\">\n<a href=\"\">\n<button type=\"button\"></button>\n<div id=\"some\"></div>\n<p></p>";

preg_match_all($re, $str, $matches);

Edit:

Use

(?!<input)<([A-Z0-9a-z]+)([^>]*>)?

If you want to save tag separately.

https://www.regex101.com/r/fG5pZ8/16

edited Jan 2, 2015 at 14:27

answered Jan 2, 2015 at 13:49

vks

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Comments

Aran-Fey · Accepted Answer · 2015-01-02 13:49:47Z

2

Use a negative lookahead like (?!input\b):

<(?!input\b)([\w]+)([^>]*>)?

To exclude multiple tags, use (?!(?:tag1|tag2|tag3|...)\b)

answered Jan 2, 2015 at 13:49

Aran-Fey

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1 Comment

vks Over a year ago

Now OP says he does not want inputasd.newaz urs is correct as per OP's original question

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