Normal Regex works but RegExp Object Doesn't

Asked Jul 28 '17 at 13:43

Active Jul 28 '17 at 13:43

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I am writing a regex to match any object and the simplest I could think of is /./g. I tested this using javascript by two possible methods(one with RegExp object and another using normal syntax).

For some reason, the regex doesn't work as expected while using the RegExp object. Please check the below code snippet and help me to understand why RegExp object returns false for 0 and 5.

var regex=new RegExp(".","g");
var objectsArray=["Hello","$234",0, 23, 234,"Text",5];
for(object of objectsArray){
  console.log("Current Value : " + object);
  console.log("Normal Regex  Result : " + /./g.test(object));
  console.log("RegExp Object Result : " + regex.test(object))
}

asked Jul 28 '17 at 13:43

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As you can see, if you add `regex.lastIndex = 0` before logging, the values will appear as expected. – Namaskar Jul 28 '17 at 13:52
@SvenTheSurfer - Thanks for the link, but I still don't understand why it doesn't work for only 0 and 5. Why don't we need to reset the lastIndex for other values? – JSN Jul 28 '17 at 13:56
Because the cursor is further than its length. – Salketer Jul 28 '17 at 13:59
@Salketer - Let me reorder the elements and confirm. – JSN Jul 28 '17 at 14:00
@Salketer - Yes, you are right. Am happy to mark this as duplicate. – JSN Jul 28 '17 at 14:02

Normal Regex works but RegExp Object Doesn't

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