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.

If you don't know the solution, then please don't give negative vote! — Harish Godara, Oct 07 '14 at 09:36

Mena · Accepted Answer · 2014-10-07T10:57:26.250

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.

edited Oct 07 '14 at 10:57

answered Oct 07 '14 at 09:38

Mena

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your solution is just make the whole string Capital. – Harish Godara Oct 07 '14 at 09:41
@HarishGodara nope. Copy it and see output. It capitalizes the first letter of all words. – Mena Oct 07 '14 at 09:42
1

@Mena he wants 0Nd0 with capital N as well. – Alboz Oct 07 '14 at 09:44
@Mena can you please double check you post, it gives me output like: '0Nd0-Cathay BAnk (Federal SAving)' – Harish Godara Oct 07 '14 at 09:55
@HarishGodara That's very weird. Gives the expected result for me. Are you sure you copypasted exactly? – Mena Oct 07 '14 at 09:57
@Mena I have copied you code and pasted it but no luck :( – Harish Godara Oct 07 '14 at 10:01
@HarishGodara I see you have accepted my answer... did it work after all? – Mena Oct 07 '14 at 10:15
@Mena I'm happy with the output: `0nd0-Cathay Bank (Federal Saving)` And tons of thanks for this. – Harish Godara Oct 07 '14 at 10:16
@Mena, What `Regex` we should use if we have the string like: `0ND0-CATHAY BANK (FEDERAL SAVING)` and output should be: `0Nd0-Cathay Bank (Federal Saving)`. I don't know about `Regex` – Harish Godara Oct 07 '14 at 10:30
@HarishGodara you would have to inverse the procedure: keep the 1st character and use `toLowerCase` on the rest (also the `Pattern` would now take a class with capital letters). I'm sure you can get it by re-using the code in my answer: change the `Pattern` and the replacement procedure. – Mena Oct 07 '14 at 10:35
@Mena, can you please edit your answer for all caps! – Harish Godara Oct 07 '14 at 10:43
@HarishGodara sigh. Done. See comments. – Mena Oct 07 '14 at 10:57

score 1 · Answer 2 · answered Oct 07 '14 at 09:55

1

This might work for you :

public static void main(String[] args) {
    String s = "0nd0-cathay bank (federal saving)";
    Pattern p = Pattern.compile("(?<![a-z])([a-z])"); // negative look-behind. check if your char is not preceeded by another char.
    Matcher m = p.matcher(s);
    while (m.find()) {
        char val = m.group(1).toUpperCase().charAt(0);
        s = s.replaceFirst(m.group(1), String.valueOf(val));
    }
    System.out.println(s);
}

O/P :

0Nd0-Cathay Bank (Federal Saving)

answered Oct 07 '14 at 09:55

TheLostMind

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What `Regex` we should use if we have the string like: `0ND0-CATHAY BANK (FEDERAL SAVING)` and output should be: `0Nd0-Cathay Bank (Federal Saving)`. I don't know about `Regex` – Harish Godara Oct 07 '14 at 10:34

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

2 Answers2