Convert camelCaseText to Sentence Case Text

var text = 'helloThereMister';
var result = text.replace( /([A-Z])/g, " $1" );
var finalResult = result.charAt(0).toUpperCase() + result.slice(1);
console.log(finalResult);

capitalize the first letter - as an example.

Note the space in " $1".

EDIT: added an example of capitalization of the first letter. Of course, in case the first letter is already capital - you would have a spare space to remove.

Alternatively using lodash:

lodash.startCase(str);

Example:

_.startCase('helloThere');
// ➜ 'Hello There'

Lodash is a fine library to give shortcut to many everyday js tasks.There are many other similar string manipulation functions such as camelCase, kebabCase etc.

I had a similar problem and dealt with it like this:

stringValue.replace(/([A-Z]+)*([A-Z][a-z])/g, "$1 $2")

For a more robust solution:

stringValue.replace(/([A-Z]+)/g, " $1").replace(/([A-Z][a-z])/g, " $1")

http://jsfiddle.net/PeYYQ/

Input:

 helloThere 
 HelloThere 
 ILoveTheUSA
 iLoveTheUSA

Output:

 hello There 
 Hello There 
 I Love The USA
 i Love The USA