PHP replacing all occurances of certain string pattern in HTML formatted text

问题

I have input text that can be long HTML text with tags and so on. Example of input can be something like:

<p>Lorem ipsum dolor sit amet, <strong>consectetur</strong> adipiscing elit.<p>
<p>%image1%</p>
<h2>Lorem ipsum</h2>
<p>Cum sociis natoque penatibus et magnis dis parturient montes.</p>
<p>%image2%</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. </p>
<p>%image3%</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. </p>
...

What would be the easiest way of finding all occurrences of text between %% characters and replacing that with <img src="image1.jpg">?

回答1:

preg_replace('|%(.+)%|', '<img src="$1">', $text );

working example: http://codepad.org/20Oz3Vok

回答2:

try using preg_replace ('/%(.+?)%/', '<img src="image1.jpg">', $string); i might be a little bit off on the regex pattern as to rather u need to escape %, and if ? is the greedy symbol.

回答3:

Try this:

preg_replace('|%(\w+)%|', '<img src="$1">', $string);

It will only allow alphanumeric characters, as well as underscores (to prevent the problem @AlexanderVarwijk pointed out in the comments).

来源：https://stackoverflow.com/questions/9432947/php-replacing-all-occurances-of-certain-string-pattern-in-html-formatted-text