Question

输入：

“纽约（路透社）”美国股指期货指数周三华尔街小幅反弹，标准普尔500指数期货上涨0.34％，道琼斯指数期货上涨0.12％，纳斯达克100期货上涨0.51％ 0921 GMT。“

输出应该是所有数字的数组，包括浮点数。

有点类似thread，但它只提取一个数字。

Answer 1

这应该这样做：

var text = "NEW YORK (Reuters) U.S. stock index futures pointed to a slight rebound on Wall Street on Wednesday, with futures for the S&P 500 up 0.34 percent, Dow Jones futures up 0.12 percent and Nasdaq 100 futures up 0.51 percent at 0921 GMT.";
console.log(text.match(/(\d[\d\.]*)/g));

您可以过滤掉无效的数字，例如55.55.55使用以下代码：

var numbers = [];
text.replace(/(\d[\d\.]*)/g, function( x ) { var n = Number(x); if (x == n) { numbers.push(x); }  })

Answer 2

这个正则表达式应该有效：

/[-+]?[0-9]*\.?[0-9]+/g

测试：

"NEW YORK (Reuters) U.S. stock index futures pointed to a slight rebound on Wall Street on Wednesday, with futures for the S&P 500 up 0.34 percent, Dow Jones futures up 0.12 percent and Nasdaq 100 futures up 0.51 percent at 0921 GMT.".match(/[-+]?[0-9]*\.?[0-9]+/g)

返回此数组：

["500", "0.34", "0.12", "100", "0.51", "0921"]

Javascript：如何从字符串中提取多个数字

2 个答案: