Remove CSS inside comments using PHP [duplicate]

Question

Let's say I have a string like this:

$css = '.class {
    color: red;
}

/* Start Comment */
.replace {
    content: "me";
}
/* End Comment */';

How can I remove everything inside the comment, including the comment itself?

I want this result:

.class {
    color: red;
}

I've tried something like this, but it doesn't do it:

$css = preg_replace( '#(/* Start Comment */).*?(/* End Comment */)#', '', $css );

I've also tried this: https://stackoverflow.com/a/13824617/2391422

Am I missing something ridiculously obvious here?

Really appreciate any feedback - regex is something I need to study further.

* is a special character, you have to escape it if you want to match a literal *. . doesn't match the newline character \n by default. To allow it to match the newline character too, you have to use the s modifier. — Casimir et Hippolyte
– Casimir et Hippolyte, Commented Oct 16, 2017 at 22:19

clemens321 · Accepted Answer · 2017-10-16 22:23:46Z

1

You can get this code to work by adding the DOTALL-modifier s http://www.php.net/manual/en/reference.pcre.pattern.modifiers.php

$css = preg_replace( '#(/\\* Start Comment \\*/).*?(/\\* End Comment \\*/)#s', '', $css );

Additionally, the * should be escaped to get the desired effect. The / are fine as you are using another delimiter.

answered Oct 16, 2017 at 22:23

clemens321

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3 Comments

miknik Over a year ago

/\/*.+;/s also matches your string

Casimir et Hippolyte Over a year ago

You don't have to use two backslashes to escape the * only one suffice. Note that you can also use the \Q...\E feature for long literal parts.

clemens321 Over a year ago

It works without but it is cleaner to always escape the backslash, even in single quotes. Besides single quotes itself the only thing to manually escape.

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