Improper usage of preg_replace

[tomasz-kusy]

Hi,
I found problem under Windows enviroment. When i start to install dev version of Revive-adserver, after composer install I had:

_Script asseteer\AssetInstaller::postInstall handling the post-install-cmd event terminated with an exception

[ErrorException]
preg_replace(): Compilation failed: PCRE does not support \L, \l, \N{name}, \U, or \u at offset 21_

There is an error on line 125 of AssetInstaller.php:
$relativeFilename = preg_replace('#^'.self::$vendorOfAssetsToCopy.'/#', '', $filename);

Value of my self::$vendorOfAssetsToCopy was:
C:\temporary\htdocs\localhost\php7\revive-adserver/lib/vendor/tinymce

Because Windows using \ as path separator self::$vendorOfAssetsToCopy should be properly escaped (?).
Temporary workaround for me was to change it to:
$relativeFilename = str_replace(self::$vendorOfAssetsToCopy, '', $filename);

Regards
TK