我试图从一个更大的字符串中提取一个字符串,它得到了a:和a之间的所有东西;

当前的

Str = 'MyLongString:StringIWant;'

期望输出值

newStr = 'StringIWant'

当前回答

下面的函数获取第一个匹配项


function getStringBetween(x: string, start: string, end: string) {
  const regex = new RegExp(`${start}(.*?)${end}`)

  if (regex.test(x)) {
    return regex.exec(x)![1]
  } else return undefined
}

有测试


test("getStringBetween", () => {
  const result = getStringBetween("<em> Jai Ram</em>", "<em>", "</em>")
  expect(result).toEqual(" Jai Ram")
  const result1 = getStringBetween(
    "hare Jai Ram hare hare hare",
    "hare",
    "hare"
  )
  expect(result1).toEqual(" Jai Ram ")
})

其他回答

你可以使用更高阶的函数来返回你的提取器的“编译”版本,这样更快。

使用正则表达式,并在闭包中编译一次正则表达式,Javascript的匹配将返回所有匹配项。

这让我们只需要删除我们用作标记的东西(例如:{{),我们可以使用字符串长度来实现slice。

function extract([beg, end]) {
    const matcher = new RegExp(`${beg}(.*?)${end}`,'gm');
    const normalise = (str) => str.slice(beg.length,end.length*-1);
    return function(str) {
        return str.match(matcher).map(normalise);
    }
}

编译一次,使用多次…

const stringExtractor = extract(['{','}']);
const stuffIneed = stringExtractor('this {is} some {text} that can be {extracted} with a {reusable} function');
// Outputs: [ 'is', 'text', 'extracted', 'reusable' ]

或者一次性使用……

const stuffIneed = extract(['{','}'])('this {is} some {text} that can be {extracted} with a {reusable} function');
// Outputs: [ 'is', 'text', 'extracted', 'reusable' ]

也可以看看Javascript的replace函数,但使用了替换参数的函数(如果你在做一个迷你模板引擎(字符串插值),你会这样做……lodash。Get也可以帮助你得到你想要替换的值?...

我的回答太长了,但它可能会帮助到一些人!

你可以试试这个

var mySubString = str.substring(
    str.indexOf(":") + 1, 
    str.lastIndexOf(";")
);

你也可以用这个…

function extractText(str,delimiter){ if (str && delimiter){ var firstIndex = str.indexOf(delimiter)+1; var lastIndex = str.lastIndexOf(delimiter); str = str.substring(firstIndex,lastIndex); } return str; } var quotes = document.getElementById("quotes"); // &#34 - represents quotation mark in HTML <div> <div> <span id="at"> My string is @between@ the "at" sign </span> <button onclick="document.getElementById('at').innerText = extractText(document.getElementById('at').innerText,'@')">Click</button> </div> <div> <span id="quotes"> My string is "between" quotes chars </span> <button onclick="document.getElementById('quotes').innerText = extractText(document.getElementById('quotes').innerText,'&#34')">Click</button> </div> </div>

您可以使用这个函数-

function getStringInBetween(string, start , end) {
    // start and end will be excluded
    var indexOfStart = string.indexOf(start)
    indexOfStart = indexOfStart + start.length;
    var newString = string.slice(indexOfStart)
    var indexOfEnd = newString.indexOf(end)
    return newString.slice(0, indexOfEnd)
}

对于前-

let string = "<div class = 'mice'> I know how to code </div>"
let start = "<div class = 'mice'> "
let end = " </div>"
//then, getStringInBetween(string, start, end) returns "I know how to code"
var s = 'MyLongString:StringIWant;';
/:([^;]+);/.exec(s)[1]; // StringIWant