從Javascript中的字符串中提取以某個字符開頭的單詞

Question

我有一個字符串，如下所示

var str = "This product price is £15.00 and old price is £19.00";

我需要得到以“£”開頭的單詞； 結果應該是“£15.00”“£19.00”如何使用Javascript？

Answer 1

使用String#match方法

 var str = "This product price is £15.00 and old price is £19.00"; // if `£` follows non-digit also then use console.log(str.match(/£\\S+/g)); // if `£` follows only number with fraction console.log(str.match(/£(\\d+(\\.\\d+)?)/g)); 

Answer 2

使用.split()將字符串轉換為數組，然后使用.filter和您要查找的內容創建一個新數組。

 var str = "This product price is £15.00 and old price is £19.00"; var r = str.split(" ").filter(function(n) { if(/£/.test(n)) return n; }); console.log(r); 

Answer 3

有可能：

var myChar = '£';
var str = "This product price is £15.00 and old price is £19.00";
var myArray = str.split(' ');
for(var i = 0; i < myArray.length; i++) {
  if (myArray[i].charAt(0) == myChar) {
    console.log(myArray[i]);
  }
}

Answer 4

您可以使用regex表達式進行以下操作，將每個識別的單詞（在這種情況下為價格）存儲在數組中，然后在需要時進行抓取

var re = /(?:^|[ ])£([a-zA-Z]+)/gm;
var str = 'This product price is £15.00 and old price is £19.00';
var identifiedWords;

while ((identifiedWords = re.exec(str)) != null) {
if (identifiedWords.index === re.lastIndex) {
re.lastIndex++;
}
// View your result using the "identifiedWords" variable.
// eg identifiedWords[0] etc.
}

Answer 5

您可以使用RegEx實現此目的：

let str = "This product price is £15.00 and old price is £19.00";
let res = str.match(/£[0-9]+(.[0-9]{1,2})?/g);

結果將是：

["£15.00", "£19.00"]

簡短說明：

此RegEx匹配所有以£符號開頭，后跟至少一位到n位數字的單詞。

£[0-9]+

..和optional有兩個十進制數字。

(.[0-9]{1,2})?

g修飾符引起全局搜索。