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)

Answer 2

Try this

function toTitleCase(str) {
    return str.replace(/\w\S*/g, function (txt) {
        return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
    });
}

alert(toTitleCase('FIRST SENTENCE. SECOND SENTENCE.'))

DEMO

With Reference

Answer 3

This JS function will apply sentence case to the initial sentence and any sentences that follow a sentence that ends with . ? !

function applySentenceCase(str) {
    var txt = str.split(/(.+?[\.\?\!](\s|$))/g);
    for (i = 0; i < (txt.length-1); i++) {
        if (txt[i].length>1){
            txt[i]=txt[i].charAt(0).toUpperCase() + txt[i].substr(1).toLowerCase();
        } else if (txt[i].length==1) {
            txt[i]=txt[i].charAt(0).toUpperCase();
        }
    }
    txt = txt.join('').replace(/\s\s/g,' ');
    return txt;
}

alert(applySentenceCase("LOREM IPSUM DOLOR SIT AMET, CONSECTETUR ADIPISCING ELIT. sed congue hendrerit risus, ac viverra magna elementum in. InTeRdUm Et MaLeSuAdA fAmEs Ac AnTe IpSuM pRiMiS iN fAuCiBuS. phasellus EST purus, COMMODO vitae IMPERDIET eget, ORNARE quis ELIT."));