JavaScript:正则表达式 CamelCase 到 Sentence

我发现 this example 将 CamelCase 更改为 Dashes。
我已修改代码以将 CamelCase 更改为 Sentencecase，其中包含空格而不是破折号。它工作正常，但不适用于一个单词的字母，例如“i”和“a”。任何想法如何合并？

thisIsAPain --> 这很痛苦

var str = "thisIsAPain";
str = camelCaseToSpacedSentenceCase(str);
alert(str)

function camelCaseToSpacedSentenceCase(str)
{
    var spacedCamel = str.replace(/\W+/g, " ").replace(/([a-z\d])([A-Z])/g, "$1 $2");
    spacedCamel = spacedCamel.toLowerCase();
    spacedCamel = spacedCamel.substring(0,1).toUpperCase() + spacedCamel.substring(1,spacedCamel.length)
    return spacedCamel;
}

最佳答案

最后一个版本:

"thisIsNotAPain"
    .replace(/^[a-z]|[A-Z]/g, function(v, i) {
        return i === 0 ? v.toUpperCase() : " " + v.toLowerCase();
    });  // "This is not a pain"

旧的解决方案:

"thisIsAPain"
    .match(/^(?:[^A-Z]+)|[A-Z](?:[^A-Z]*)+/g)
    .join(" ")
    .toLowerCase()
    .replace(/^[a-z]/, function(v) {
        return v.toUpperCase();
    });  // "This is a pain"

console.log(
    "thisIsNotAPain"
        .replace(/^[a-z]|[A-Z]/g, function(v, i) {
            return i === 0 ? v.toUpperCase() : " " + v.toLowerCase();
        })  // "This is not a pain"
);

console.log(
    "thisIsAPain"
        .match(/^(?:[^A-Z]+)|[A-Z](?:[^A-Z]*)+/g)
        .join(" ")
        .toLowerCase()
        .replace(/^[a-z]/, function(v) {
            return v.toUpperCase();
        })  // "This is a pain"
);

关于JavaScript:正则表达式 CamelCase 到 Sentence，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13720256/