/**
* @return mixed|string
* @throws BuildException
*/
protected function doReplace()
{
if ($this->replace === null) {
throw new BuildException('No replace expression specified.');
}
$this->reg->setPattern($this->pattern);
$this->reg->setReplace($this->replace);
$this->reg->setModifiers($this->modifiers);
$this->reg->setIgnoreCase(!$this->caseSensitive);
$this->reg->setLimit($this->limit);
try {
$output = $this->reg->replace($this->subject);
} catch (Exception $e) {
$output = $this->defaultValue;
}
return $output;
}