replace(1.4이전에서 구현)

public static String replace(String str, String pattern, String replace) {


if(str == null || str.length() < 1) return "";

int s = 0;

int e = 0;

StringBuffer result = new StringBuffer();

while ((e = str.indexOf(pattern, s)) >= 0) {

result.append(str.substring(s, e));

result.append(replace);

s = e+pattern.length();

}

result.append(str.substring(s));

return result.toString();

}