如何在javascript中使用匹配函數獲取字符串

Question

我試圖從*開始並使用匹配函數結束於*的字符串。我得到的字符串數組不是一個字符串。 我的代碼是

Str="==Quotes==* We thought that he was going to be -- I shouldn't say this at Christmastime -- but the next messiah.** On [[Barack Obama]]" 

regE=/\* \w*/gi 
newArr=str.match(regE) 
console.log(newArr) 

Answer 1

你的正則表達式略有偏差。爲了兩個星號之間的匹配，你正在尋找/\*([^*]*)\*/gi：

str = "==Quotes==* We thought that he was going to be -- I shouldn't say this at Christmastime -- but the next messiah.** On [[Barack Obama]]"; 
 
regE = /\*([^*]*)\*/gi; 
 
newArr = str.match(regE); 
 
console.log(newArr[0]);

注意.match()返回匹配的陣列。爲了獲得第一個匹配，您可以簡單地訪問第一個索引[0]，如上所述。

希望這會有所幫助！ :)

Answer 2

您應該使用：

1. 非貪婪匹配（嘗試匹配更小的字符串，因爲它可以）：

str = "==Quotes==* We thought that he was going to be -- I shouldn't say this at Christmastime -- but the next messiah.** On [[Barack Obama]]"; 
 
    regE = /\*.*?\*/gi; 
 
    newArr = str.match(regE); 
 
    console.log(newArr[0]);

貪婪的匹配（儘量匹配更大的字符串，因爲它可以）：

str = "==Quotes==* We thought that he was going to be -- I shouldn't say this at Christmastime -- but the next messiah.** On [[Barack Obama]]"; 
 
    regE = /\*.*\*/gi; 
 
    newArr = str.match(regE); 
 
    console.log(newArr[0]);