在每個點（。）和字符串開始後大寫單詞

Question

如何在字符串開頭和點（。）符號之後大寫每個單詞？

我做了谷歌和計算器研究，以下是我實現但這隻會利用字符串的開始的代碼。示例如下：

var str = 'this is a text. hello world!'; 
 
str = str.replace(/^(.)/g, str[0].toUpperCase()); 
 
document.write(str);

我希望字符串是This is a text. Hello world!.

我曾嘗試使用CSS，text-transform: capitalize;但是這將導致每個字被利用。

Answer 1

我使用類似這樣的函數，它接受一個可選的第二個參數，該參數將首先將整個字符串轉換爲小寫字母。原因是有時你有一系列Title Case Items. That You Wish變成一系列Title case items. That you wish作爲判例。

function sentenceCase(input, lowercaseBefore) { 
    input = (input === undefined || input === null) ? '' : input; 
    if (lowercaseBefore) { input = input.toLowerCase(); } 
    return input.toString().replace(/(^|\. *)([a-z])/g, function(match, separator, char) { 
     return separator + char.toUpperCase(); 
    }); 
} 

正則表達式的工作原理如下

1st Capturing Group (^|\. *) 
    1st Alternative^
     ^asserts position at start of the string 
    2nd Alternative \. * 
     \. matches the character `.` literally (case sensitive) 
     * matches the character ` ` literally (case sensitive) 
     * Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy) 
2nd Capturing Group ([a-z]) 
    Match a single character present in the list below [a-z] 
    a-z a single character in the range between a (ASCII 97) and z (ASCII 122) (case sensitive) 

你會實現它在你的榜樣，像這樣：

var str = 'this is a text. hello world!'; 
str = sentenceCase(str); 
document.write(str); // This is a text. Hello world! 

例jsfiddle

PS。在未來，我覺得regex101瞭解和測試正則表達式的

Answer 2

如果您正在使用jQuery，使用此代碼

function capitalize(str) { 
    return str.charAt(0).toUpperCase() + str.slice(1); 
} 
var str = "my name is Jhon. are you good. is it"; 
var str1 = str.split('.'); 
var str2 = ""; 
$.each(str1,function(i){ 
    str2 += capitalize($.trim(str1[i]))+'. '; 
}); 
console.log(str2); 

漁獲出來放在str2一個非常有用的工具。 在我的情況如下。

My name is Jhon. Are you good. Is it.