创建短代码的方法，用PHP添加html打开和关闭标签到字符串

Question

I'm not sure if I am phrasing this right as it's not exactly shortcodes.

What I am trying to achieve is to create a function that find a replaces asterisks in my strings. But I need to alternate first and second replace.

$srting = 'Create personalised *tasty treats*';

I need to account for multiple uses of it, for example like this string below...

$srting = 'Create personalised *tasty treats* and branded *promotional products*';

The first * will be replaced with a opening <span class="d-inline-block">

The second * will be replaced with a closing </span>

And the the cycle repeats again for any more uses of * in the string.

I'm not sure what the most efficient way is to approach this, is this something that could be done with regex? Any ideas would be great thanks.

---

Updated working function below using accepted answer.

public static function word_break_fix($string) {

   $newString = preg_replace('/\\*([^*]*)\\*/s', '<span class="d-inline-block">\\1</span>', $string);

   return $newString;

}

Answer 1

Just use preg_replace capturing everything between two asterisks. You can reference a capturing group from the replacement by a backslashed number.

preg_replace('/\\*([^*]*)\\*/s', '<span class="d-inline-block">\\1</span>', $subject)

https://regex101.com/r/i7fm8X/1/

Note that in PHP regular expressions are built by strings, thus you escape characters once for the regex and the backslash is escaped again when using string literals.

Answer 2

Yes, this is absolutely something ideally suited for regex!

For tag replacement, something like this works well:

<?php

$string = 'Create personalised *tasty treats* and branded *promotional products* *tasty treats*';

$replace = preg_replace_callback("/(\\*[a-zA-Z\\s]*\\*)/m", function ($matches) {
    switch($matches[0])
    {
        case "*tasty treats*":
            return "Chocolate!";
        case "*promotional products*":
            return "DRINK COCA COLA!";
    }
    return $matches[0];
}, $string);

echo $replace;

Here's a link to Regex101 so you can see and learn how the regex works: https://regex101.com/r/pyCTZU/1

But to inject HTML as you specified, try this:

<?php

$string = 'Create personalised *tasty treats* and branded *promotional products* *tasty treats*';

$replace = preg_replace_callback("/(\\*[a-zA-Z\\s]*\\*)/m", function ($matches) {

    return "<span class=\"d-inline-block\">".substr($matches[0], 1, strlen($matches[0]) - 2)."</span>";

}, $string);

echo $replace;