Regex to Match All HTML Tags Except <P> and </P>

Regex to match all HTML tags except p and /p

I came up with this:

<(?!\/?p(?=>|\s.*>))\/?.*?>

x/
<           # Match open angle bracket
(?!         # Negative lookahead (Not matching and not consuming)
    \/?     # 0 or 1 /
    p           # p
    (?=     # Positive lookahead (Matching and not consuming)
    >       # > - No attributes
        |       # or
    \s      # whitespace
    .*      # anything up to 
    >       # close angle brackets - with attributes
    )           # close positive lookahead
)           # close negative lookahead
            # if we have got this far then we don't match
            # a p tag or closing p tag
            # with or without attributes
\/?         # optional close tag symbol (/)
.*?         # and anything up to
>           # first closing tag
/

This will now deal with p tags with or without attributes and the closing p tags, but will match pre and similar tags, with or without attributes.

It doesn't strip out attributes, but my source data does not put them in. I may change this later to do this, but this will suffice for now.

Javascript replace regex all html tags except p,a and img

You may match the tags to keep in a capture group and then, using alternation, all other tags. Then replace with $1:

(<\/?(?:a|p|img)[^>]*>)|<[^>]+>

Demo: https://regex101.com/r/Sm4Azv/2

And the JavaScript demo:

var input = 'b<body>b a<a>a h1<h1>h1 p<p>p p</p>p img<img />img';var output = input.replace(/(<\/?(?:a|p|img)[^>]*>)|<[^>]+>/ig, '$1');console.log(output);

Regexp to remove all html tags except br

I ended up using :

.replace('<br>','%br%').replace(/(<([^>]+)>)/g,'')

then I split on the '%br%' instead of the regular br tag.
It is not an HTML parser, I am sure it will fail to parse 100% of the World Wide Web, and it solves my particular problem 100% of the time (just tried and tested).

RegEx match open tags except XHTML self-contained tags

Strip all HTML tags except links

<(?!\/?a(?=>|\s.*>))\/?.*?>

Try this. Had something similar for p tags. Worked for them so don't see why not. Uses negative lookahead to check that it doesn't match a (prefixed with an optional / character) where (using positive lookahead) a (with optional / prefix) is followed by a > or a space, stuff and then >. This then matches up until the next > character. Put this in a subst with

s/<(?!\/?a(?=>|\s.*>))\/?.*?>//g;

This should leave only the opening and closing a tags

Match all HTML tags except for li with regex

Something like <\/?(?:(?!li).)+> should do the trick. I've taken notes from https://stackoverflow.com/a/977294/9484862 to edit your existing regex code, which was already nearly working.

Regex needed to remove and replace specified html tags in two criteria's using C#

You may use capture groups in your regex and use them in the substitution according to the documentation here: http://msdn.microsoft.com/en-us/library/e7f5w83z

//to remove all h1 tags:
Regex.Replace(html, @"</?h1[^>]*>", "")

//to replace all div tags with p, keeping the same attributes:
Regex.Replace(html, @"(</?)div([^>]*>)", "$1p$2")

//to change the attributes of the div tags you will need two regexes:
//one for the opening tags
Regex.Replace(html, @"<div[^>]*>", "<p class='content'>")
//one for the closing tag
Regex.Replace(html, @"</div>", "</p>")

The last example was added to answer a comment, and the reason why it needs to be two is because the new part of the string (which will be added) is different.