我如何转换字符串既像'helloThere'或'helloThere'到'HelloThere'在JavaScript?
当前回答
我的分裂案例解决方案的行为方式,我想:
const splitCase = s => !s || s.indexOf(' ') >= 0 ? s :
(s.charAt(0).toUpperCase() + s.substring(1))
.split(/(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])/g)
.map(x => x.replace(/([0-9]+)/g,'$1 '))
.join(' ')
输入
'a,abc,TheId,TheID,TheIDWord,TheID2Word,Leave me Alone!'
.split(',').map(splitCase)
.forEach(x => console.log(x))
输出
A
Abc
The Id
The ID
The ID Word
The ID2 Word
Leave me Alone!
由于上述函数需要在JS中使用Lookbehind,而目前Safari中还没有实现,因此我重写了实现,以不使用下面的RegEx:
const isUpper = c => c >= 'A' && c <= 'Z'
const isDigit = c => c >= '0' && c <= '9'
const upperOrDigit = c => isUpper(c) || isDigit(c)
function splitCase(s) {
let to = []
if (typeof s != 'string') return to
let lastSplit = 0
for (let i=0; i<s.length; i++) {
let c = s[i]
let prev = i>0 ? s[i-1] : null
let next = i+1 < s.length ? s[i+1] : null
if (upperOrDigit(c) && (!upperOrDigit(prev) || !upperOrDigit(next))) {
to.push(s.substring(lastSplit, i))
lastSplit = i
}
}
to.push(s.substring(lastSplit, s.length))
return to.filter(x => !!x)
}
其他回答
我也遇到过类似的问题,我是这样处理的:
stringValue.replace(/([A-Z]+)*([A-Z][a-z])/g, "$1 $2")
对于更健壮的解决方案:
stringValue.replace(/([A-Z]+)/g, " $1").replace(/([A-Z][a-z])/g, " $1")
http://jsfiddle.net/PeYYQ/
输入:
helloThere
HelloThere
ILoveTheUSA
iLoveTheUSA
输出:
hello There
Hello There
I Love The USA
i Love The USA
HTTPRequest_ToServer-AndWaiting --> HTTP Request To Server And Waiting
function toSpaceCase(str) { return str .replace(/[-_]/g, ' ') /* * insert a space between lower & upper * HttpRequest => Http Request */ .replace(/([a-z])([A-Z])/g, '$1 $2') /* * space before last upper in a sequence followed by lower * XMLHttp => XML Http */ .replace(/\b([A-Z]+)([A-Z])([a-z])/, '$1 $2$3') // uppercase the first character .replace(/^./, str => str.toUpperCase()) .replace(/\s+/g, ' ') .trim(); } const input = 'HTTPRequest_ToServer-AndWaiting'; const result = toSpaceCase(input); console.log(input,'-->', result)
连续大写单词的最兼容的答案是:
常量文本 = 'theKD'; const result = text.replace(/([A-Z]{1,})/g, “$1”); const finalResult = result.charAt(0).toUpperCase() + result.slice(1); 控制台.log(最终结果);
它也与KD兼容,不会将其转换为KD。
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'
我的分裂案例解决方案的行为方式,我想:
const splitCase = s => !s || s.indexOf(' ') >= 0 ? s :
(s.charAt(0).toUpperCase() + s.substring(1))
.split(/(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])/g)
.map(x => x.replace(/([0-9]+)/g,'$1 '))
.join(' ')
输入
'a,abc,TheId,TheID,TheIDWord,TheID2Word,Leave me Alone!'
.split(',').map(splitCase)
.forEach(x => console.log(x))
输出
A
Abc
The Id
The ID
The ID Word
The ID2 Word
Leave me Alone!
由于上述函数需要在JS中使用Lookbehind,而目前Safari中还没有实现,因此我重写了实现,以不使用下面的RegEx:
const isUpper = c => c >= 'A' && c <= 'Z'
const isDigit = c => c >= '0' && c <= '9'
const upperOrDigit = c => isUpper(c) || isDigit(c)
function splitCase(s) {
let to = []
if (typeof s != 'string') return to
let lastSplit = 0
for (let i=0; i<s.length; i++) {
let c = s[i]
let prev = i>0 ? s[i-1] : null
let next = i+1 < s.length ? s[i+1] : null
if (upperOrDigit(c) && (!upperOrDigit(prev) || !upperOrDigit(next))) {
to.push(s.substring(lastSplit, i))
lastSplit = i
}
}
to.push(s.substring(lastSplit, s.length))
return to.filter(x => !!x)
}
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