The usage of preg_replace had two errors:
1) The regular expression was wrong
2) $matches[0] always contains the full matched string, not the first parenthesized subpattern
The correct version of preg_replace would've been:
if (preg_match('/^Icinga\\\\Module\\\\([A-Za-z]+)\\\\/', get_called_class(), $matches) === 1) {
return strtolower($matches[1]);
}
But since there's no benefit of using a regular expression here except less speed, I replaced it
with using explode.
refs #7551
50bbf77d0c