javascript 匹配字符串中的任意/所有多个单词
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Match any/all of multiple words in a string
提问by Azevedo
I'm trying to write this regEx (javascript) to match word1and word2(when it exists):
我正在尝试编写这个 regEx (javascript) 来匹配word1和word2（当它存在时）：
This is a test. Here is word1 and here is word2, which may or may not exist.
This is a test. Here is word1 and here is word2, which may or may not exist.
I tried these:
我试过这些：
(word1).*(word2)?
(word1).*(word2)?
This will match only word1regardless if word2exists or not.
这只会匹配，word1无论是否word2存在。
(word1).*(word2)
(word1).*(word2)
This will match both but onlyif both exists.
这将匹配两者，但前提是两者都存在。
I need a regex to match word1 and word2 - which may or may not exist.
我需要一个正则表达式来匹配 word1 和 word2 - 这可能存在也可能不存在。
回答by Phrogz
var str = "This is a test. Here is word1 and here is word2, which may or may not exist.";
var matches = str.match( /word1|word2/g );
//-> ["word1", "word2"]
String.prototype.matchwill run a regex against the string and find all matching hits. In this case we use alternationto allow the regex to match either word1or word2.
String.prototype.match将对字符串运行正则表达式并找到所有匹配的命中。在这种情况下，我们使用交替来允许正则表达式匹配word1或word2。
You need to apply the global flag to the regex so that match()will find all results.
您需要将全局标志应用于正则表达式，以便match()找到所有结果。
If you care about matching only on word boundaries, use /\b(?:word1|word2)\b/g.
如果您只关心单词边界上的匹配，请使用/\b(?:word1|word2)\b/g.
