正则表达式以匹配这种重复模式？

Question

I was able to match the string [ORG] someText with this regex: /^\\[(ORG|PER|LOC)]\\s[^\\W_]+$/

 var selectedText = "[ORG] dd"; if (selectedText.match(/^\\[(ORG|PER|LOC)]\\s[^\\W_]+$/)) { console.log("working"); } 

The input text could have anything in the tag followed by any word.

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Now I have the text as: [ORG] Lorem [ORG] ipsum (ending with a space)

I tried to match this by grouping the pattern and repeating it with a + (one or more occurances).

This way: /^(\\[(ORG|PER|LOC)]\\s[^\\W_]\\s)+$/

However it doesnt match.

Basically, it should match:

[tag] sometext

[tag] sometext [tag2] someOtherText // ending with or without a space

So, in general, it needs to match a pattern of a tag followed by a space and a word .

What it shouldnt match:

[tag] sometext someMoreText

[tag] sometext someMoreText [tag9]

[tag] [tag9] sometext someMoreText 

Answer 1

It should be:

/^(\[(ORG|PER|LOC)]\s[^\W_]+(?:\s|$))+$/

... that is, adding an alternation between a whitespace and the end-of-line boundary (for the last pattern in the string doesn't end with a whitespace).

Demo . Also note that if you only need to check whether or not a string matches that pattern, String#match method is actually an overkill; instead you should RegExp#text :

var tagsPattern = /^(\[(ORG|PER|LOC)]\s[^\W_]+(\s|$))+$/;
if (tagsPattern.test(str)) {
  // matches 
}