var str = 'abc正則’ var objRE = new RegExp(/[a-zA-Z0-9_]*/) var match = str.match(objRE)

if (match[0].length>0){ console.log(‘match’) }else{ console.log(‘no match’) }

====================================== RegExp 不太懂 …

var str = ‘abc正則’

var objRE = new RegExp(/[^a-zA-Z0-9_]/g) var match = str.match(objRE)

if(match==null){ console.log(‘match’) }else{ console.log(‘no match’) }

這個才正確