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regular expression back references?

Posted on 2002-04-04
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Last Modified: 2010-03-31
stupid question - I am using String's replaceAll(pattern, replacement) how do I reference the captured groups "(whatever)" from the pattern in the replacement?  \1 doesn't work (and the documentation says that's what it is) and neither does \\1

thanks
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Question by:_D_
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4 Comments
 

Author Comment

by:_D_
ID: 6920218
ok never mind that - figured it out, different question though:

what I need to do is convert the string to "Title Case", ie first letter of every word capitalized, what I have for the replace so far is:

replaceAll("\\b(\\w)","$1")

which just relaces each first character with the same one - how to I capitalize that back reference?  Or do I need to do this is some completely different way?

thanks
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Expert Comment

by:Venci75
ID: 6920351
.
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LVL 19

Accepted Solution

by:
Jim Cakalic earned 200 total points
ID: 6922112
The most straightforward way -- without using regular expressions -- is probably something like this:

    public String toTitleCase(String s) {
        char[] chars = s.toCharArray();
        int length = chars.length;
        boolean fixNext = true;
        for (int i = 0; i < length; ++i) {
            if (Character.isWhitespace(chars[i])) {
                fixNext = true;
            } else if (fixNext) {
                chars[i] = Character.toTitleCase(chars[i]);
                fixNext = false;
            }
        }
        return new String(chars);
    }

Best regards,
Jim Cakalic
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Author Comment

by:_D_
ID: 6933488
no quite what I was looking for, but I don't see a better way
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