正则表达式过滤非缩小文件

Question

I am trying to write a regex to filter non-minified JavaScript files from an array.

Currently, the following expression works:

array_filter($paths, function($path) {
    return preg_match('@\.js$@', $path) && !preg_match('@\.min\.js$@', $path);
});

However, I wanted to write this as a single regular expression:

preg_grep('SOME_REGEX_HERE', $paths);

Answer 1

You can use lookbehind:

preg_match('@(?<!\.min)\.js$@', $path);

Here (?<!\.min) is negative lookbehind that makes sure .js is matched only when it is not preceded by .min