java - How to remove multiple special characters from a String without any inbuilt functions like replaceAll() for jdk 1.4 below -

using below function able remove single special character, need multiple types of them removed single string.

static public string replaceall(string str, string replace, string replacement )   {        stringbuffer sb = new stringbuffer( str );   int firstoccurrence = sb.tostring().indexof( replace );    while( firstoccurrence != -1 )    {      sb.replace( firstoccurrence, firstoccurrence + replace.length(), replacement );            firstoccurrence = sb.tostring().indexof( replace );   }    return sb.tostring();    }  

needs works below jdk 1.4 without inbuilt function replaceall()

thanks.

what remove special characters, such control characters, non-ascii special characters ascii ones this.

public static string stripspecialcharacters(string str) {    stringbuffer sb = new stringbuffer();     for(int i=0;i<str.length();i++) {         char ch = str.charat(i);         if (character.isletterordigit(ch) || character.isspacechar(ch))             sb.append(ch);     }     return sb.tostring(); } 

note: want avoid creating multiple characters or re-arranging characters in stringbuffer these become o(n^2) operations in context.