Why output of my Javascript regex is inconsistent? -

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this question has answer here:

in browser console output of following function series of alterante true , false. idea? 

      function checkspecificlanguage(text_val) {     // force string type`enter code here`           var regex =   /^[\u3000-\u303f\u3040-\u309f\u30a0-\u30ff\uff00-\uffef\u4e00-\u9faf\u2605-\u2606\u2190-\u2195u203b]+$/ig;           console.log( text_val+"-"+regex.test(text_val) );         console.log( text_val+"-"+regex.test(text_val) );         console.log( text_val+"-"+regex.test(text_val) );         console.log( text_val+"-"+regex.test(text_val) );         console.log( text_val+"-"+regex.test(text_val) );         return  regex.test(text_val);     }  checkspecificlanguage("でしたコンサート");

you're using global (g) flag.

according mdn:

as exec() (or in combination it), test() called multiple times on same global regular expression instance advance past previous match.

you can around setting lastindex.


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