什么是正则表达式，允许我在此标记内获取文本？

Question

Using a regex, how can I delete/replace everything and keep only the score inside the tag?

The data-v is variable.

<a href="/football/italy/1-division-phase-a/fixtures/7-days/#" data-y="f1" data-v="this-is-variable">2 - 0</a>

Answer 1

You can use regex in preg_match() to select target part of string.

preg_match("/>([^<]+)</", $str, $matches);
echo $matches[1];

See result in demo

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Also because your string is html, you can parse it using DOMDocument class and get text of element.

$dom = DOMDocument::loadHTML($str);
$text = $dom->getElementsByTagName("a")->item(0)->nodeValue;

See result in demo