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();
});
}
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)