String Manipulation

Hi Experts ..

I'm writing a method to make some manipulations on a *String*, and there is 2D integer array, each row in this 2D array represents the first index,last index of substring of the given string to apply some changes on it.
e.g:
String input = "Experts-Exchange ";
int[][] parts = <<invoke method that returns the specified parts>>
now
for(int i = 0; i<parts.length; ++i){
                sb.append(input.substring(0,parts[i][0])); // append the part before the substring
                String str = <<invoke method that do some changes on the substring(input.substring(parts[i][0], parts[i][1])) may be convert it to upper case, lower case, replacing, or whaterver>>
                sb.append(str); // the manipulated string
                sb.append(input.substring(parts[i][1])); // the part after the manipulated string
                input = sb.toString();
                sb.delete(0, sb.length());
            }
I'm posting here cause I couldn't find a better way to tokenize the string and join it again ..
so, I want your opinion about the code I've posted?? or if you've a better way to do that?
LVL 9
DrAskeAsked:
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Mayank SAssociate Director - Product EngineeringCommented:
Maybe try using the split () method where you can.
0
DrAskeAuthor Commented:
could you please explain more??
0
cavey_79Commented:
There is no better way to do it. split() will work if you just want to split it based on some regex, but it will be slower for simple cases since it uses regex.

You could try looking into StringUtils here:
http://jakarta.apache.org/commons/lang/api-release/org/apache/commons/lang/StringUtils.html
but that will just make your code safer, the approach will still be the same.
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DrAskeAuthor Commented:
I don't want to use any external packages, there is restriction for that, so I can't use it.

thank you :o)
regards,
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