如何在javascript中使用匹配函数获取字符串

Question

我试图从*开始并使用匹配函数结束于*的字符串。我得到的字符串数组不是一个字符串。 我的代码是

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

你的正则表达式略有偏差。为了两个星号之间的匹配，你正在寻找/\*([^*]*)\*/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()返回匹配的阵列。为了获得第一个匹配，您可以简单地访问第一个索引[0]，如上所述。

希望这会有所帮助！ :)

Answer 2

您应该使用：

1. 非贪婪匹配（尝试匹配更小的字符串，因为它可以）：

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]);

贪婪的匹配（尽量匹配更大的字符串，因为它可以）：

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]);