Why output of my Javascript regex is inconsistent? -
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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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