How to capitalize each letter after a special letter in android?

Question

First of all, please don't mark it as duplicate.

I have a very specific problem. I have to capitalize each word's first letter. Problem is that I can't find-out when a word start.

For example, I have given String:

0nd0-cathay bank (federal saving)

And output should be as following:

0Nd0-Cathay Bank (Federal Saving).

Currently I'm having following method for title case:

public static String toTitleCase(String str) 
{
    if (str == null) 
        return "";

    boolean space = true;
    StringBuilder builder = new StringBuilder(str);
    final int len = builder.length();

    for (int i=0; i < len; ++i) 
    {
        char c = builder.charAt(i);

        if (space) 
        {
            if (!Character.isWhitespace(c)) 
            {
                // Convert to title case and switch out of whitespace mode.
                builder.setCharAt(i, Character.toTitleCase(c));
                space = false;
            }
        } 
        else if (Character.isWhitespace(c)) 
        {
            space = true;
        } 
        else 
        {
            builder.setCharAt(i, Character.toLowerCase(c));
        }
    }

    return builder.toString();
}

Thanks all.

Answer 1

You can use the following solution with regex (not the prettiest though).

String input = "0nd0-cathay bank (federal saving)";
// case-sensitive Pattern:
//                              | group 1: first letter
//                              |      | group 2: any other character if applicable
//                              |      |    | word boundary
Pattern p = Pattern.compile("([a-z])(.*?)\\b");
// Pattern for all capital letters 
// Pattern p = Pattern.compile("([A-Z])(.*?)\\b");
// initializing StringBuffer for appending
StringBuffer sb = new StringBuffer();
Matcher m = p.matcher(input);
// iterating over matches
while (m.find()) {
   // appending replacement:
   //                      | 1st letter capitalized
   //                      |                        | concatenated with...
   //                      |                        |     | any other character
   //                      |                        |     | within word boundaries
   m.appendReplacement(sb, m.group(1).toUpperCase().concat(m.group(2)));
   // Replacement for all capital letters
   // m.appendReplacement(sb, m.group(1).concat(m.group(2).toLowerCase()));
}
// appending tail if any
m.appendTail(sb);
System.out.println(sb.toString());

Output

0Nd0-Cathay Bank (Federal Saving)

Notes

• This will capitalize the first alphabetic character in all words, even if words do not start with an alphabetic character.
• For instance, 0nd0 becomes 0Nd0.
• If you don't want this edge case after all, prepend a word boundary (\\b) to the Pattern.