/。如果没有换行符，*/效果很好。如果它必须匹配换行符，这里有一些解决方案:

Regex: /I bought.*sheep./ Matches - the whole string till the end of line I bought sheep. I bought a sheep. I bought five sheep. Regex: /I bought(.*)sheep./ Matches - the whole string and also capture the sub string within () for further use I bought sheep. I bought a sheep. I bought five sheep. I boughtsheep. I bought a sheep. I bought fivesheep. Example using Javascript/Regex 'I bought sheep. I bought a sheep. I bought five sheep.'.match(/I bought(.*)sheep./)[0]; Output: "I bought sheep. I bought a sheep. I bought five sheep." 'I bought sheep. I bought a sheep. I bought five sheep.'.match(/I bought(.*)sheep./)[1]; Output: " sheep. I bought a sheep. I bought five "

(.*?)匹配任何东西-我已经使用它很多年了。

试试这个:

I bought (.* )?sheep

甚至

I bought .*sheep

通常点匹配除换行符以外的任何字符。

因此，如果。*不起作用，设置“点也匹配换行符”选项(或使用(?s).*)。

如果您正在使用JavaScript，它没有“dotall”选项，请尝试[\s\ s]*。这意味着“匹配任意数量的空白或非空白字符”——有效地“匹配任何字符串”。

另一个只适用于JavaScript的选项是[^]*，它也匹配任何字符串。但是[\s\ s]*似乎使用得更广泛，可能是因为它更便于携带。

<?php
$str = "I bought _ sheep";
preg_match("/I bought (.*?) sheep", $str, $match);
print_r($match);
?>

http://sandbox.phpcode.eu/g/b2243.php