extractEmail - Don't modify string without email
assert(extractEmail("this is not an email<noat>") == "this is not an email<noat>");
extractEmail - Don't modify string with only email
assert(extractEmail("anna.andersson@example.com") == "anna.andersson@example.com");
extractEmail - Extract email from string
assert(extractEmail( "\"Anna Andersson\" <anna.andersson@example.com>") == "anna.andersson@example.com");
isValidEmail - Valid email should return true
assert(isValidEmail("\"Anna Andersson\" <anna.andersson@example.com>"));
isValidEmail - Invalid email should return false
assert(!isValidEmail("\"Anna Andersson\" <anna.anderssonexample.com>")); assert(!isValidEmail("Anna Andersson"));