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"]