正则表达式分裂骆驼案

Question

我在JavaScript中有一个正则表达式,使用以下代码将我的驼峰大小写字母分割为大写字母(我后来从这里得到):

"MyCamelCaseString"
    .replace(/([A-Z])/g, ' $1')
    .replace(/^./, function(str){ return str.toUpperCase(); })

因此返回:

"My Camel Case String"

这很好.但是,我想把它提升一个档次.有人可以帮助我使用正则表达式,只有当前一个字符为小写且后者为大写时才会拆分.

因此,上面的例子将是我期望的结果,但如果我这样做:

"ExampleID"

然后我回来了:

"Example ID"

代替

"Example I D"

因为它在每个大写字母中分裂并忽略它之前的任何内容.

希望有道理!谢谢:).

Answer 1

我的猜测是代替/([A-Z])/用/([a-z])([A-Z])/和' $1'用'$1 $2'

"MyCamelCaseString"
    .replace(/([a-z])([A-Z])/g, '$1 $2');

/([a-z0-9])([A-Z])/ 对于计为小写字符的数字

console.log("MyCamelCaseStringID".replace(/([a-z0-9])([A-Z])/g, '$1 $2'))

Answer 2

"MyCamelCaseString".replace(/([a-z](?=[A-Z]))/g, '$1 ')

输出:

"My Camel Case String"

Answer 3

如果你想要一个小写单词数组:

"myCamelCaseString".split(/(?=[A-Z])/).map(s => s.toLowerCase());

如果你想要一串小写单词:

"myCamelCaseString".split(/(?=[A-Z])/).map(s => s.toLowerCase()).join(' ');

如果你想分开单词但保留外壳:

"myCamelCaseString".replace(/([a-z])([A-Z])/g, '$1 $2')

Answer 4

有时，camelCase 字符串包含缩写，例如：

PDFSplitAndMergeSamples
PDFExtractorSDKSamples
PDFRendererSDKSamples
BarcodeReaderSDKSamples

在这种情况下，以下函数将起作用，它将字符串拆分为单独的字符串：

function SplitCamelCaseWithAbbreviations(s){
   return s.split(/([A-Z][a-z]+)/).filter(function(e){return e});
}

例子：

PDFSplitAndMergeSamples
PDFExtractorSDKSamples
PDFRendererSDKSamples
BarcodeReaderSDKSamples

Answer 5

我发现这个问题的答案在所有情况下都不起作用，而且对于 unicode 字符串也根本不起作用，所以这里的答案可以完成所有操作，包括破折号和下划线符号分割。

\n

\r\n

\r\n

let samples = [\n  "ThereIsWay_too  MuchCGIInFilms These-days",\n  "UnicodeCanBeCAPITALISEDTooYouKnow",\n  "CAPITALLetters at the StartOfAString_work_too",\n  "As_they_DoAtTheEND",\n  "BitteWerfenSie-dieFu\xc3\x9fballeInDenM\xc3\xbcll",\n  "IchHabeUberGesagtNicht\xc3\x9cber",\n  "2BeOrNot2Be",\n  "ICannotBelieveThe100GotRenewed. It-isSOOOOOOBad"\n];\n\nsamples.forEach(sample => console.log(sample.replace(/([^[\\p{L}\\d]+|(?<=[\\p{Ll}\\d])(?=\\p{Lu})|(?<=\\p{Lu})(?=\\p{Lu}[\\p{Ll}\\d])|(?<=[\\p{L}\\d])(?=\\p{Lu}[\\p{Ll}\\d]))/gu, \'-\').toUpperCase()));

\r\n

\r\n

\r\n

\n

如果您不希望将数字视为小写字母，则：

\n

\r\n

\r\n

let samples = [\n  "2beOrNot2Be",\n  "ICannotBelieveThe100GotRenewed. It-isSOOOOOOBad"\n];\n\nsamples.forEach(sample => console.log(sample.replace(/([^\\p{L}\\d]+|(?<=\\p{L})(?=\\d)|(?<=\\d)(?=\\p{L})|(?<=[\\p{Ll}\\d])(?=\\p{Lu})|(?<=\\p{Lu})(?=\\p{Lu}\\p{Ll})|(?<=[\\p{L}\\d])(?=\\p{Lu}\\p{Ll}))/gu, \'-\').toUpperCase()));

\r\n

\r\n

\r\n

\n

Answer 6

如果您想大写并在数字之间添加空格，这是可行的。

transform(value: string, ...args: any[]): string {
    const str = 'this1IsASampleText';
    str.charAt(0).toUpperCase() + value.slice(1); // Capitalize the first letter
    str.replace(/([0-9A-Z])/g, ' $&'); // Add space between camel casing
}

结果：

This 1 Is A Sample Text