从字符串的开头和结尾删除<br>标签

Question

How would I, given a string like this (for example), remove all break (<br>,<br />, and any other form) tags from only the beginning and end of the string?

Original string:

<br>Hello, World! https://www.youtube.com/watch?v=NU7W7qe2R0A<br><br>

Output:

Hello, World! https://www.youtube.com/watch?v=NU7W7qe2R0A

If the original string has <br> tags in the middle of the string, i.e.:

<br>Hello, World!<br><br>https://www.youtube.com/watch?v=NU7W7qe2R0A<br><br>

It should output:

Hello, World!<br><br>https://www.youtube.com/watch?v=NU7W7qe2R0A

How would I achieve this results?

Answer 1

You could use preg_replace and a regular expression like this.

$s = '<br><br /><Br  ><br   />Hello, World!<br><br />testing 123<br  ><BR   /><br><br />';

$stripped = preg_replace('/^(<br\s*\/?>)*|(<br\s*\/?>)*$/i', '', $s);

var_dump($stripped);

Outputs:

string(57) "Hello, World!<br><br />testing 123"