str_ireplace（） - 我可以获取要替换的字符串吗？ [重复]

Question

This question already has an answer here:

• PHP preg_replace: Case insensitive match with case sensitive replacement 3 answers

I have the following strings.

$string = "Welcome to Lorien.";
$search = "welcome";

Now I want to search for $search in $string and ignoring the case, so:

$result = str_ireplace($search,  '<b>'.$search.'</b>' ,$string);

$result should look like this: welcome to Lorien.

Is there a way i can use the case of $string so it looks like this: Welcome to Lorien.

Like getting the part of the string which is getting replaced and use it?

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Answer 1

You can use preg_replace() for this:

$string = "Welcome to Lorien.";
$search = "welcome";

$result = preg_replace("/{$search}/i", '<b>$0</b>', $string);

• The /i-flag makes the matching case-insensitive.
• The $0 will be replaced with the matched string from the original string so the casing will always be correct.

Demo: https://3v4l.org/vN9Km