Replace All Quotes That Are Not In Html-tags

currently i am replacing all my quotes inside a text with special quotes. But how can i change my regex that only quotes inside the text will be replaced and not the ones who are

Solution 1:

This regex works for the given strings.

Search for   - "([^<>]*?)"(?=[^>]*?<)
Replace with - &raquo;\1&laquo;

Demo here
Testing it -

INPUT - 
<p>This is a "wonderful long text". "Another wonderful ong text" At least it should be. Here we have a <a href="http://wwww.site-to-nowhere.com" target="_blank">link</a>.</p>

OUTPUT - 
<p>This is a &raquo;wonderful long text&laquo;. &raquo;Another wonderful ong text&laquo; At least it should be. Here we have a <a href="http://wwww.site-to-nowhere.com" target="_blank">link</a>.</p>

EDIT 1-
Executing this in PHP -

$str = '<p>This is a "wonderful long text". "Another wonderful ong text" At least it should be. Here we have a <a href="http://wwww.site-to-nowhere.com" target="_blank">link</a>.</p>';
var_dump(preg_replace('/"([^<>]*?)"(?=[^>]*?<)/', '&raquo;\1&laquo', $str));

It's output -

/** OUTPUT **/
string '<p>This is a &raquo;wonderful long text&laquo. &raquo;Another wonderful ong text&laquo At least it should be. Here we have a <a href="http://wwww.site-to-nowhere.com" target="_blank">link</a>.</p>' (length=196)

EDIT 2-
You have executed the preg_replace function properly, but in the replacement string, you have used \1 inside the Double quotes(""). Doing so, you are escaping the 1 itself and that won't be replaced.
To make it more clear, try this and see what happens -

echo '»\1«';
echo "»\1«";

The second \1 should not be visible.
So the solution would be one of these -

preg_replace('/"([^<>]*?)"(?=[^>]*?<)/', '&raquo;\1&laquo;', $str)
preg_replace("/\"([^<>]*?)\"(?=[^>]*?<)/", "&raquo;\\1&laquo;", $str)
preg_replace("/\"([^<>]*?)\"(?=[^>]*?<)/", "&raquo;$1&laquo;", $str)

Read the Replacement section in this page for more clarity.

EDIT 3-
A regex that covers text which might not be enclosed within tags-

\"([^<>]*?)\"(?=(?:[^>]*?(?:<|$)))

Demo here

Solution 2:

Could also use a negative lookahead:

(?![^<]*>)"([^"]+)"

Replace with: »\1«

Solution 3:

For the record, there is a simple PHP solution that was not mentioned and that efficiently skips over all the <a...</a> tags.

Search: <a.*?<\/a>(*SKIP)(*F)|"([^"]*)"

Replace: »\1«

In the Demo, look at the Substitutions at the bottom.

Reference

How to match (or replace) a pattern except in situations s1, s2, s3...

Solution 4:

Use this regex:

(?<=^|>)[^><]+?(?=<|$)

This will match non html strings.

And then do your regex on the resultant string