In tyepscript, how do I confirm that a string conforms to a ruleset such as

/^\S+@\S+$/i

Also, please explain what this is defining exactly?

I know I could say:

String something = "Test123@"

for (char c: something)

if c == 'A' || c == '1' && ...... but this seems like a lot of work as opposed to the above ruleset for a string to abide by.