CODEWITHSUNDEEP
phpregex
Cole
Cole

Reputation: 459

Allowing up to 2 consecutive line breaks in HTML

For example:

StackOverflow<br>
<br>
<br>
<br>
<br>
is
<br>
<br>
<br>
<br>
a
<br>
community.

To:

StackOverflow
<br>
<br>
is
<br>
<br>
a
<br>
community.

If there are more than 2 <br> in a string, it should delete all the <br> and keep only two. Code so far:

$txt_unclean = trim(nl2br($_POST['txt_content']));
$txt_content = strip_tags($txt_unclean, '<br>');

What is the next step? How do I allow no more than 2 <br>.

Upvotes: 0

Views: 605

Answers (3)

uınbɐɥs
uınbɐɥs

Reputation: 7341

Since you have access to the string before newlines are converted into <br>s, this is how I'd do it:

<?php
$string = <<<END
1
2


3




4




5
END;
$string = trim(nl2br(preg_replace('/(\r?\n){3,}/', '$1$1', $string)));
echo $string;

Output:

1<br />
2<br />
<br />
3<br />
<br />
4<br />
<br />
5

[Demo]

Upvotes: 4

Ja͢ck
Ja͢ck

Reputation: 173572

If your mark-up is controlled like that, you could use preg_replace to match more than two consecutive <br>:

$txt_content = preg_replace('/(<br>\s*){3,}/', '$1$1', $txt_content);

To also match self-closing tags:

$txt_content = preg_replace('/(<br\s*/>\s*){3,}/', '$1$1', $txt_content);

Otherwise, I would consider using a DOM parser to do this work; having said that, it's not as easy :)

Upvotes: 6

Nemoden
Nemoden

Reputation: 9056

Following code in action:

<?php
$str = <<<STR
StackOverflow<br>
<br>
<br>
<br>
<br>
is
<br>
<br>
<br>
<br>
a
<br>
community.
STR;
echo preg_replace("!(<br(?:\s?/)?>\s*){2,}!s", "<br />\n<br />\n", $str);

Upvotes: 0

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