如何在第一个（变量）html-tag之间提取部分字符串？

Question

I have some strings:

$string1 = '<p><strong>Extract me</strong></p><p>Leave me</p>';
$string2 = '<strong>Extract me</strong>Leave me';
$string3 = '<span style="font-weight: bold">Extract me</span><br /><span>Leave me</span>';

Let's check $string3:

The first tag of the string is <span> So the text between the first <span> and the first </span> wants to be extracted.

Extracted shall mean: remove it from $stringX and save it into $extractedX

How would I do this?

Answer 1

[^>]*?(?=<\/.*>)

What you should do is use an assertion. [^>]*? searches for any character that is NOT a >. This should be fine since if you need to use > as text, it would need to be escaped as >. Then it searches for the first closing tag as denoted by <\/.*>. The (?=) around it tells the regex engine not to include it in the match.

http://regexr.com?30pkm