Format lowercased string to capitalize the begining of each sentence

Question

I have a string like

FIRST SENTENCE. SECOND SENTENCE.

I want to lowercase the string in that way to capitalize the first letter of each sentence.

For example:

string = string.toLowerCase().capitalize();

only the first sentence is capitalized.

I have the

String.prototype.capitalize = function() { return this.charAt(0).toUpperCase() + this.slice(1); }

function

Does anyone know how to solve?

Answer 1

If you only want to capitalize the first word of each sentence (not every word), then use this function:

function applySentenceCase(str) {
    return str.replace(/.+?[\.\?\!](\s|$)/g, function (txt) {
        return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
    });
}

JSFiddle here

If you want to keep the formatting of the rest of the sentence and just capitalize the first letters, change txt.substr(1).toLowerCase() to txt.substr(1)