[JAVA] replaceAll 정규식

public String replaceStringAll(String source, String regex, String replacement) { 

	if(source == null || regex == null || replacement == null){ 
		return null; 
	}
    
    regex = regex.replaceAll("\\.", "\\\\."); 
    regex = regex.replaceAll("\\*", "\\\\*"); 
    regex = regex.replaceAll("\\?", "\\\\?"); 
    regex = regex.replaceAll("\\+", "\\\\+"); 
    regex = regex.replaceAll("\\[", "\\\\["); 
    regex = regex.replaceAll("\\{", "\\\\{"); 
    regex = regex.replaceAll("\\(", "\\\\("); 
    regex = regex.replaceAll("\\)", "\\\\)"); 
    regex = regex.replaceAll("\\^", "\\\\^"); 
    regex = regex.replaceAll("\\|", "\\\\|"); 
    regex = regex.replaceAll("\\$", "\\\\\\$"); 
    
    return source.replaceAll(regex, replacement); 
}