php - preg_replace 文本中的链接，但有一些例外

Answer 1

$string = preg_replace("/<a(.*?)>/", "<a$1 target=\"_blank\">", $string);

这将添加一个额外的target=\"_blank\"incase 它已经设置。

$string = preg_replace("/<a (href=".*?").*?>/", "<a $1 target="_blank">", $string);

这将确保target="_blank"在 URL 中只添加一个

例如：- http://www.phpliveregex.com/p/6qG

Answer 2

这将添加目标：

$string = preg_replace("/<a(.*?)>/", "<a$1 target=\"_blank\">", $string);

这是一种检测 URL 并将它们变成链接的粗略方法（这很脆弱）：

$string = preg_replace("/(http[^\ ]+)/", "<a href=\"$1\" target=\"_blank\">$1</a>", $string);

Answer 3

First, I would use some XML/HTML processing library, to get text between tags, then using simple regex:

PHP validation/regex for URL

make all URLs as links.

Answer 4

$result = preg_replace(
  "/(?<![\>https?:\/\/|href=\"'])(?<http>(https?:[\/][\/]|www\.)([a-z]|[A-Z]|[0-9]|[\/.&?= ]|[~])*)/",
  "<a href=\"$1\">$1</a>",
  $string
);