JavaScript Regular expression requirements not strict enough

If you want to ensure that the entire content matches a regular expression, there are a few ways, but my favorite is just using the regular expression itself.

You can use the line start ^ and line end $ characters. These are called anchors and you can read about them at http://www.regular-expressions.info/anchors.html

Your code would look like this:

control.value.match(/^(?:(?:http|https):\/\/)?(?:www.)?instagram.com\/([A-Za-z0-9-_]+)$/igm)

This only works because you're looking at a single line of text. Your m flag would imply multiline text (which doesn't make any sense with a url), so you should take a closer look at http://www.regular-expressions.info/modifiers.html. In javascript, modifiers for the entire expression are placed as flags at the end. You can see examples of that at http://www.rexegg.com/regex-modifiers.html.

In your example, your flags are igm and come after the closing /.

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