我如何转换字符串既像'helloThere'或'helloThere'到'HelloThere'在JavaScript?


当前回答

如果你处理的是大写骆驼的情况,这个片段可以帮助你,它还包含一些规格,所以你可以确保它适合你的情况。

export const fromCamelCaseToSentence = (word) =>
  word
    .replace(/([A-Z][a-z]+)/g, ' $1')
    .replace(/([A-Z]{2,})/g, ' $1')
    .replace(/\s{2,}/g, ' ')
    .trim();

和规格:

describe('fromCamelCaseToSentence', () => {
 test('does not fall with a single word', () => {
   expect(fromCamelCaseToSentence('Approved')).toContain('Approved')
   expect(fromCamelCaseToSentence('MDA')).toContain('MDA')
 })

 test('does not fall with an empty string', () => {
   expect(fromCamelCaseToSentence('')).toContain('')
 })

 test('returns the separated by space words', () => {
   expect(fromCamelCaseToSentence('NotApprovedStatus')).toContain('Not Approved Status')
   expect(fromCamelCaseToSentence('GDBState')).toContain('GDB State')
   expect(fromCamelCaseToSentence('StatusDGG')).toContain('Status DGG')
 })
})

其他回答

这个对我有用看看这个

CamelcaseToWord(“名字”);//返回我的名字

    function CamelcaseToWord(string){
      return string.replace(/([A-Z]+)/g, " $1").replace(/([A-Z][a-z])/g, " $1");
    }

上面的答案对我来说都不完美,所以我不得不带着自己的自行车:

function camelCaseToTitle(camelCase) {
    if (!camelCase) {
        return '';
    }

    var pascalCase = camelCase.charAt(0).toUpperCase() + camelCase.substr(1);
    return pascalCase
        .replace(/([a-z])([A-Z])/g, '$1 $2')
        .replace(/([A-Z])([A-Z][a-z])/g, '$1 $2')
        .replace(/([a-z])([0-9])/gi, '$1 $2')
        .replace(/([0-9])([a-z])/gi, '$1 $2');
}

测试用例:

null => ''
'' => ''
'simpleString' => 'Simple String'
'stringWithABBREVIATIONInside => 'String With ABBREVIATION Inside'
'stringWithNumber123' => 'String With Number 123'
'complexExampleWith123ABBR890Etc' => 'Complex Example With 123 ABBR 890 Etc'

此解决方案也适用于不在[A-Z]范围内的其他Unicode字符。例如:Ä, Ö, Å。

let camelCaseToTitleCase = (s) => (
  s.split("").reduce(
    (acc, letter, i) => (
      i === 0 || console.log(acc, letter, i)
        ? [...acc, letter.toUpperCase()] 
        : letter === letter.toUpperCase()
        ? [...acc, " ", letter]
        : [...acc, letter] 
    ), []
  ).join("")
)

const myString = "ArchipelagoOfÅland"
camelCaseToTitleCase(myString)

输入 javaScript

输出 Java脚本

   var text = 'javaScript';
    text.replace(/([a-z])([A-Z][a-z])/g, "$1 $2").charAt(0).toUpperCase()+text.slice(1).replace(/([a-z])([A-Z][a-z])/g, "$1 $2");

另一个基于RegEx的解决方案。

respace(str) {
  const regex = /([A-Z])(?=[A-Z][a-z])|([a-z])(?=[A-Z])/g;
  return str.replace(regex, '$& ');
}

解释

上面的正则表达式由两个相似的部分组成,由OR运算符分开。前半部分:

([A-Z]) -匹配大写字母… (?=[a-z] [a-z]) -后面跟着一个大写字母和小写字母的序列。

当应用于序列FOo时,它有效地匹配它的F字母。

或者第二种情况:

([a-z]) -匹配小写字母… (?=[A-Z]) -后面跟着一个大写字母。

当应用于序列barFoo时,它有效地匹配了它的r字母。

当找到所有替换候选时,最后要做的事情是用相同的字母替换它们,但要使用额外的空格字符。为此,我们可以使用'$& '作为替换,它将解析为一个匹配的子字符串,后面跟着一个空格字符。

例子

const regex = /([A-Z])(?=[A-Z][a-z])|([a-z])(?=[A-Z])/g
const testWords = ['ACoolExample', 'fooBar', 'INAndOUT', 'QWERTY', 'fooBBar']

testWords.map(w => w.replace(regex, '$& '))
->(5) ["A Cool Example", "foo Bar", "IN And OUT", "QWERTY", "foo B Bar"]