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Replace Substings with Substrings

Posted on 2007-04-01
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Last Modified: 2010-03-31
With the following code below I can replace all the A's with T1.
But I am not sure how to replace B with T2 C with T3 at the same time.

String Text="AACB";
String output="";

String patternStrA = "A";
String replacementStrA = "T1";
   
// Compile regular expression
Pattern patternA = Pattern.compile(patternStrA);

// Replace all occurrences of pattern in input
Matcher matcherA = patternA.matcher(Text);

output = matcherA.replaceAll(replacementStrA);
 System.out.println(output);
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Question by:mr_usmannaeem
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6 Comments
 
LVL 12

Expert Comment

by:keyurkarnik
ID: 18834491
First - Do not  use pattern-matcher for this - they are expensive to use if you are not going to compile and keep them for future use. Here you need to check it once or twice at max, and you will need to create 26 or 52 matchers depending on the english alphabet and case sensitive behaviour.

You can do this as follows :

1. Parse the string characterwisein a for loop
2. Take every character, and get its ascii value
3. Subtract the ascii value from the ascii value of 'A'
4. Take the result and add 1 to it.
5. Now append the result to 'T', and append the resulting string to a new string (sue StringBuffer)

At the end of the loop you would have the full new string


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LVL 12

Expert Comment

by:keyurkarnik
ID: 18834492
Experts - please do not post any code here
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Author Comment

by:mr_usmannaeem
ID: 18835251
sample code would be helpful....please
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LVL 12

Expert Comment

by:keyurkarnik
ID: 18835267
tell you what -
write in some code according to the algo - i will hep modify it :)
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Author Comment

by:mr_usmannaeem
ID: 18835315
String Text="AACB";
String output="";

for(int i=0;i<Text.length();i++){
StringBuilder buf = new StringBuilder();

char temp=Text.charAt(i);
      
// I dont get how to the ascii part, but understood the structure of your algo
      
   buf.append(temp);
   output=buf.toString();
}
System.out.println(output);

Thanks for your help
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LVL 12

Accepted Solution

by:
keyurkarnik earned 150 total points
ID: 18835379
There is a problem here -
You have initialized buf every time inside the for loop - so you will get only the last character.
Same case with output



Here is what you need


String Text = "AACB";
      String output = "";
      char A = 'A';
     
      StringBuilder buf = new StringBuilder();
     
      for (int i = 0; i < Text.length(); i++)
      {
         

         int temp = Text.charAt(i) - A + 1;

         //       I dont get how to the ascii part, but understood the structure of your algo

         buf.append('T').append(temp);
      }
      output = buf.toString();
      System.out.println(output);

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