public function escapeCharacterClass($char)
	{
		return (isset($this->inCharacterClass[$char])) ? $this->inCharacterClass[$char] : $char;
	}
public function escapeCharacterClass($char)
	{
		return (isset($this->inCharacterClass[$char])) ? $this->inCharacterClass[$char] : $char;
	}
public function escapeCharacterClass ( $ char ) { return ( isset ( $ this -> inCharacterClass [ $ char ] ) ) ? $ this -> inCharacterClass [ $ char ] : $ char ; }
Escape given character to be used in a character class

@param  string $char Original character
@return string       Escaped character
Escape given character to be used in a character class