in src/main/java/org/apache/sling/installer/factory/model/impl/FeatureModelInstallerPlugin.java [225:240]
boolean classifierMatches(String classifier) {
boolean select = this.classifierPatterns.isEmpty();
if (!select) {
if (classifier == null) {
classifier = "";
}
for (final Pattern pattern : this.classifierPatterns) {
select = pattern.matcher(classifier).matches();
if (select) {
break;
}
}
}
return select;
}