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    <p>First script: The first result is the whole pattern, the second is the capturing group</p> <p>Second script: the only result is the whole pattern.</p> <p>Capturing groups are not only to refer later in the pattern, they are displayed in results too.</p> <p>When you use a capturing group with split, the capturing group is returned with results and since the separator is supposed to slice the string, it is normal that you obtain <code>["", " ", ""]</code> as result with <br><code>" "</code> as input string and <code>/(\s)/</code> as pattern.</p> <p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split" rel="nofollow">More informations about split.</a></p> <p>When you write <code>" ".match(/(\s)/)</code> the result returned is the first match. This result is unique and contains:</p> <ul> <li>the whole match</li> <li>capturing group(s)</li> <li>index of the match</li> <li>input string</li> </ul> <p>When you write <code>" ".match(/(\s)/g)</code> the result returned is all the matches:</p> <ul> <li>whole match 1</li> <li>whole match 2</li> <li>etc.</li> </ul> <p>(in the present case you have only one match)</p> <p>This behaviour is normal. The match method as two different behaviours (with or without <code>/g</code>). It is a kind of two functions in one. For comparison in PHP (or other languages) which doesn't have the <code>g</code> modifier, you have two different functions: <code>preg_match</code> and <code>preg_match_all</code></p>
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    1. POWhy capturing group results in double matches regex
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    1. USCasimir et Hippolyte
    1. USCasimir et Hippolyte
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    1. POWhy capturing group results in double matches regex
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    1. VO
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      1. VTUpMod
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    1. COi'm confused. the 2nd result belongs to 2nd script which has no capturing group.
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      1. USTechsin
    2. COi see...but how does this play out with split. " ".split(/\s/) => ["", ""] ..... " ".split(/(\s)/) => ["", " ", ""]
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      1. USTechsin
    3. COHave you tried reading the documentation of `.split()`? Doesn't it say what it does with the capture groups?
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      1. USBarmar
 

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