JavaScript 匹配数组 [英] JavaScript match against array

问题描述

我想知道如何将字符串与正则表达式数组进行匹配.
我知道如何循环遍历数组.
我也知道如何通过制作一个由 |
分隔的长正则表达式来做到这一点我希望有一种更有效的方式，比如

I would like to know how to match a string against an array of regular expressions.
I know how to do this looping through the array.
I also know how to do this by making a long regular expression separated by |
I was hoping for a more efficient way like

if (string contains one of the values in array) {

例如:

string = "the word tree is in this sentence";  
array[0] = "dog";  
array[1] = "cat";  
array[2] = "bird";  
array[3] = "birds can fly";  

在上面的例子中，条件为假.
但是，string = "她告诉我鸟可以飞，我同意" 会返回 true.

In the above example, the condition would be false.
However, string = "She told me birds can fly and I agreed" would return true.

推荐答案

如何在需要时动态创建正则表达式(假设数组随时间变化)

How about creating a regular expression on the fly when you need it (assuming the array changes over time)

if( (new RegExp( '\\b' + array.join('\\b|\\b') + '\\b') ).test(string) ) {
  alert('match');
}

演示:

string = "the word tree is in this sentence"; 
var array = [];
array[0] = "dog";  
array[1] = "cat";  
array[2] = "bird";  
array[3] = "birds can fly";  

if( (new RegExp( '\\b' + array.join('\\b|\\b') + '\\b') ).test(string) ){
    alert('match');
}
else{
    alert('no match');
}

对于支持 javascript 1.6 版的浏览器，您可以使用 some() 方法

For browsers that support javascript version 1.6 you can use the some() method

if ( array.some(function(item){return (new RegExp('\\b'+item+'\\b')).test(string);}) ) {
 alert('match');
}

演示:

string = "the word tree is in this sentence"; 
var array = [];
array[0] = "dog";  
array[1] = "tree";  
array[2] = "bird";  
array[3] = "birds can fly";  

if ( array.some(function(i){return (new RegExp('\\b'+i+'\\b')).test(string);}) ) {
 alert('match');
}

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