正则表达式多次替换包围的单词

Question

I'm trying to replace all " " in twig syntax when it's surrounded by "{%" and "%}" or "{{" and "}}".

For example in the following string :

<p>{{ myFunction()&nbsp; }}</p>    
<p>&nbsp;</p>    
<p>{{ number|number_format(2, "&nbsp;.&nbsp;", '&nbsp;,&nbsp;')&nbsp;}}</p>    
<p>{% set myVariable = '&nbsp;&nbsp;' %}</p>

I want to replace every " " by "" except the "<p>&nbsp;</p>" one.

I'm doing the following :

$content = preg_replace('/({[{%].*)( )(.*[}%]})/', '$1 $3', $content);

but it replace only one occurrence of "&nbsp" in each brackets surroundings.

How to make it for all?

Answer 1

I'm trying to replace all   in twig syntax when it's surrounded by {% and %} or {{ and }}.

If you are seeking for the easiest solution, just match all substrings that start with {{ and end with }}, or that start with {% and end with %} with '~{{.*?}}|{%.*?%}~s' regex, and use the pattern with the preg_replace_callback where you can further manipulate the match value inside the anonymous function:

preg_replace_callback('~{{.*?}}|{%.*?%}~s', function ($m) {
     return str_replace(' ', '', $m[0]); 
}, $s);

See the PHP demo

Pattern details:

• {{.*?}} - match {{, then any 0+ characters as few as possible (due to the lazy *? quantifier) up to the closest }}
• | - or
• {%.*?%} - match {%, then any 0+ characters as few as possible up to the closest %}
• ~s' - enables the DOTALL modifier so that.` could also match newline symbols.