匹配字符串中的任何/所有多个单词

Question

我正在尝试编写此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.

我试过这些:

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(word1).*(word2)?

这只会匹配,word1无论是否word2存在.

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(word1).*(word2)

这将匹配两者,但仅在两者都存在时才匹配.

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我需要一个正则表达式匹配word1和word2 - 可能存在也可能不存在.

Answer 1

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.match将对字符串运行正则表达式并找到所有匹配的匹配.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.

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.

如果您只关心字边界的匹配,请使用/\b(?:word1|word2)\b/g.