用变量替换字符串的一部分，但使用复杂的分隔符

Question

I know that I can use str_replace to replace certain things quite easily in a string. But I'm completely stuck with how to do it when I cannot find a really easy delimiter for the content.

I have strings which can have links anywhere in them, e.g

$tweet = "Testing a tweet with a link https://t.co/h4C0aobVnK in the middle";

or

$tweet = "Testing a tweet with a link: https://t.co/dgg0eA3uIt";

I have a variable $embedded_link which contains a prettified <a> tag ready to go. E.g

<a href="https://dev.twitter.com/oauth/application-only" target="_blank">dev.twitter.com/oauth/applicat…</a>

I need to replace the link, which always starts with https:// and is defined by ending when there is a next space, and replace it with $embedded_url

So this:

$tweet = "Testing a tweet with a link https://t.co/h4C0aobVnK in the middle";

Becomes this:

$tweet = "Testing a tweet with a link <a href="https://dev.twitter.com/oauth/application-only" target="_blank">dev.twitter.com/oauth/applicat…</a> in the middle";

How would you go about this? I was thinking of using https:// and a space as the delimiters, but it's possible for there to be no space at the end of the string.

Answer 1

It appears from your examples following should work for you:

$tweet = preg_replace('~\bhttps://\S+~', $embedded_url, $tweet);

RegEx Demo