find index of duplicate words inside string

Hello,
I need to find the index of a word with in a text.
I've been using the text.indexOf(word) function but i have problems when there is more than one of the word.
Like "With the power of the sun."
If the word i needed was the second "the" in the text, i wouldn't be able to find the index with indexOf because it just takes the index of the first "the".
I can't check for the nth occurrence of the word i'm searching for because in the program I don't know what the occurrence of the word is in the text or where it is in the text. (I'm using a scanner to traverse). Any advice would be appreciated.

It looks like you're using Strings. Java Strings has a lot of member functions. Take a look at the member function substring(int beginIndex).

I'm trying to get the index though.

Quote:

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Originally Posted by onions

i wouldn't be able to find the index with indexOf because it just takes the index of the first "the".

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There are four overloads of indexOf(...) -- choose the one that can do what you need.

db

Once you find the index then use substring(index+3) to get a new substring 0f the old string, i.e. " power of the sun". Then, you can use indexOf(word) again.

Also, you might want to try lastIndexOf. I haven't use it though.

Quote:

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Originally Posted by DarrylBurke

There are four overloads of indexOf(...) -- choose the one that can do what you need.

db

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Darryl suggestion is much better.

Code:

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public JTextPane findPercent(String text,JTextPane textPane) throws BadLocationException{
        String num;
        Integer startIndex=0,endIndex=0;
        Pattern p = Pattern.compile("[- +]?\\d+(\\.\\d+)?[\\s]?%");
        Matcher m = p.matcher(text);
        while (m.find()) {
            num=m.group().trim();
            startIndex=text.toString().indexOf(num);
            endIndex=startIndex+num.length();
            textPane=highlight(textPane,startIndex,endIndex);
        }   
        textPane=highlight(textPane,startIndex,endIndex);
        return textPane;
    }

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This is one of the codes that will search the text.
In the string "This is 50% and this is 35% and 50% is a 50% number with 50%. Why is 50% 1/2 but 35% is not?"
It will only find the ones i colored and bolded.
The other overloads of indexOf require an index to start looking which I dont see how I can obtain this way.

Try something like this:

Code:

---

....
while ( (startIndex=text.toString().indexOf(num,startIndex)) > 0 )
{
  endIndex=startIndex+num.length(); 
  textPane=highlight(textPane,startIndex,endIndex);
  startIndex = endIndex;
}
....

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Searching for words within text is a little problematic because of punctuation and things. You might want to investigate BreakIterator.

Quote:

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Originally Posted by shall

Try something like this:

Code:

---

....
while ( (startIndex=text.toString().indexOf(num,startIndex)) > 0 )
{
  endIndex=startIndex+num.length(); 
  textPane=highlight(textPane,startIndex,endIndex);
  startIndex = endIndex;
}
....

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This worked perfectly. Thank you!