I'm trying to get all the text which start with @ and replace them with the needed text

here's it's regex

/@([a-z_\d]+)/gi

Now the issue I'm facing is I just wanted to get the text if it's alone like

example: hey @hasham my email is vakanihasham@gmail.com

When I run the regex, it should provide me with the @hasham value but not the @gmail. I tried a solution by addingin \s to check empty space before the matching parameter but the issue I'm having is that when the @hasham is first in the paragraph, it doesn't get it because there is no empty space before trying to find a way. How can I simply select the independent words that fit my regex?