Convert a string to proper case

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This code provides a method that turns improper casing (LIKE THIS or like this) to title casing (Like This).

Contents

Implementations

Erlang

capitalize(S) ->
    F = fun([H|T]) -> [string:to_upper(H) | string:to_lower(T)] end,
    string:join(lists:map(F, string:tokens(S, " ")), " ").

Haskell

import Data.Char (toUpper, toLower)

proper :: String -> String
proper = unwords . map capitalize . words
  where capitalize (x:xs) = toUpper x : map toLower xs

For example: 

> proper "foO BAr"
"Foo Bar"

Java

Method

public String makeProper(String theString) throws java.io.IOException{
	 
	java.io.StringReader in = new java.io.StringReader(theString.toLowerCase());
	 boolean precededBySpace = true;
	 StringBuffer properCase = new StringBuffer();    
	     while(true) {      
	 	int i = in.read();
	 	  if (i == -1)  break;      
	 	    char c = (char)i;
	 	    if (c == ' ' || c == '"' || c == '(' || c == '.' || c == '/' || c == '\\' || c == ',') {
	 	      properCase.append(c);
	 	      precededBySpace = true;
	 	   } else {
	 	      if (precededBySpace) { 
	 		 properCase.append(Character.toUpperCase(c));
	 	   } else { 
	 	         properCase.append(c); 
	 	   }
	 	   precededBySpace = false;
	 	}
	    }
	 
	return properCase.toString();    
	 
}

Test class

public static void main(String[] args) {
	StringUtils util = new StringUtils();
	try {
		System.out.println(util.makeProper("testing tESTig TeStInG123 "+
                       "1jf94osl TEST TEST test test. doe, john. DOE, JOHN"));
	} catch (java.io.IOException e) {
		System.out.println("Exception:" + e);
	}
}

Original Source: Java Forum

Method 2(Java 6 + RegEx)

public static String toProperCase(String input) {
//A pattern for all (UNICODE-) lower case characters preceded by a word boundary
        Pattern p = Pattern.compile("\\b([\\p{javaLowerCase}])",Pattern.UNICODE_CASE);
        Matcher m = p.matcher(input);
        StringBuffer sb = new StringBuffer(input.length());
        while (m.find()) {
            m.appendReplacement(sb, m.group(1).toUpperCase());
        }
        m.appendTail(sb);
        return sb.toString();
    }

JUnit Test for Method 2

public void testProperCase() {
        String test = StringUtil.toProperCase("es regnet-so.scho"n^im_walde");
        assertEquals("Es Regnet-So.Scho"n^Im_walde", test);
    }

Objective-C

NSString *a = @"foO BAr";
NSString *b = [a capitalizedString];

//This may be regarded more of a Cocoa solution than a strict Objective-C solution.

OCaml

# #load "str.cma";;
# let proper string =
    let words = Str.split (Str.regexp " ") (String.lowercase string) in
    String.concat " " (List.map String.capitalize words);;
val proper : string -> string = <fun>

For example: 

# proper "hello world";;
- : string = "Hello World"

Perl

print ucfirst lc for split /\b/;

PHP

$a = 'foO BAr';
$b = ucwords(strtolower($a));

Python

a = 'hello world! how are you?'
b = ' '.join(i.capitalize() for i in a.split(' '))

Alternatively: 

import string
b = string.capwords(a, ' ')

Another method: 

b = a.title()

These two methods differ on how they determine word boundary. For example, title() considers apostrophes to separate words, while capwords() does not: 

>>> string.capwords("they're bill's friends from the UK")
"They're Bill's Friends From The Uk"
>>> "they're bill's friends from the UK".title()
"They'Re Bill'S Friends From The Uk"

Ruby

 "foO BAr".upcase   # => "FOO BAR"
 "foO BAr".downcase # => "foo bar"

Tcl 

 proc to_proper_case s {return [string toupper [string index $s 0]][string tolower [string range $s 1 end]]}
test:
 puts [to_proper_case "FoO BAr"]       ;# -> Foo bar
also, builtin command "string totitle"
 puts [string totitle "FoO BAr"]       ;# -> Foo bar
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