Question

I have a templating system to show things based on $this->cms_language() value.
In this case, the $value will be replaced with something matched the regex pattern.
It works just as http://www.getnocms.com/2012/11/better-multi-language-template-better.html

    $language = $this->cms_language();
    $pattern = array();
    $pattern[] = "/\{\{ if_language:$language \}\}(.*?)\{\{ elif_language:.*?\{\{ end_if }}/s";
    $pattern[] = "/\{\{ if_language:$language \}\}(.*?)\{\{ else \}\}.*?\{\{ end_if }}/s";
    $pattern[] = "/\{\{ if_language:$language \}\}(.*?)\{\{ end_if }}/s";
    $pattern[] = "/\{\{ if_language:.*?\{\{ elif_language:$language \}\}(.*?)\{\{ elif_language:.*?\{\{ end_if }}/s";
    $pattern[] = "/\{\{ if_language:.*?\{\{ elif_language:$language \}\}(.*?)\{\{ else \}\}.*?\{\{ end_if }}/s";
    $pattern[] = "/\{\{ if_language:.*?\{\{ elif_language:$language \}\}(.*?)\{\{ end_if }}/s";
    $pattern[] = "/\{\{ if_language:.*?\{\{ else \}\}(.*?)\{\{ end_if }}/s"; 
    $replacement = '$1';
    $value = preg_replace($pattern, $replacement, $value);

So far everything was so good. But then, I noticed a problem. For example, I write a text area or an input that contains any of those pattern. Something like:

$value = '<input value="{{ if_language:indonesia }} do_something {{ end_if }}" />';

I don’t want the input value to be replaced even if it is match with the regex.
Since I’ve use a lot of patterns here, how is the most effective way to avoid this?

Answer 1

You may try to add

foreach ($pattern as &$p) {
  $p = preg_replace("/^\//", "/(?![^<>]*>|(?:[^>]*<\/(?:[tT][eE][xX][tT][aA][rR][eE][aA]|[sS][eE][lL][eE][cC][tT])[^<>]*>))", $p);

} }

before your existing preg_replace to avoid this in most cases.

See this demo.