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POWhy is Regex Javascript //g flag affecting state?
 

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  1. POWhy is Regex Javascript //g flag affecting state?
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    <p>I had <a href="https://stackoverflow.com/questions/9860057/javascript-regex-match-defective">another question</a> and although it was answered i dont understand WHY the regex is affected the way it is</p> <p>From <a href="http://www.w3schools.com/jsref/jsref_obj_regexp.asp" rel="nofollow noreferrer">w3schools</a> it says</p> <blockquote> <p>g: Perform a global match (find all matches rather than stopping after the first match)</p> </blockquote> <p>Ok sure. I understand. Thats why i get an array in this code</p> <pre><code>var str="The rain in SPAIN stays mainly in the plain"; var patt1=/ain/gi; document.write(str.match(patt1)); </code></pre> <p>Output:</p> <pre><code>ain,AIN,ain,ain </code></pre> <p>Regex is similar, with <code>/g</code> it will replace more than one instance.</p> <p>However in match</p> <pre><code>var re=/hi/gi; alert(re.test("hi") + " " + re.test("hi")); </code></pre> <p>The result is "true false".</p> <p>Now why the $%^&amp; does it do that? The string in both test are exactly the same! In the past i thought global meant it will search across newlines (which is what i wanted to do in this test). The very first thing i quoted was about g being a global match.</p> <p>Nothing makes any reference about it affecting the NEXT CALL! without /g the code will work correctly (also i dont need to go across newlines). WHY is it affecting the next test? gumbo answer makes mention it affects the lastIndex across calls and what the %^&amp;* i had no idea there is shared state as the other two functions made no use of it while i used the g flag. I only wanted a true and false but if anything shouldnt match return an int containing the amount of matches it found globally? (ie 1 in "hi" but 2 in the string "hihi").</p> <p>Why the heck is g affecting my next call when doing regex.test?! Also if you can, provide when i'd actually want that 'feature'</p>
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    1. COw3schools is not to be trusted, see [w3fools](http://w3fools.com) for details. If you get your JS information anywhere, get it from [MDN](https://developer.mozilla.org/).
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    2. CO@zzzzBov I tried to find a 'javascript' manual in the past and didnt think of mdn bc i thought it was firefox specific. ok i will check there next time!
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